Changes you said you would make:
-I think I'll give them improved grapple at level 3, and improved grab at level 11 or 12.
-I might also put in some augments to make it better at luring creatures to it (such as a compulsion affect for things to want to approach and/or protect it if they see it).SKIN:
Basic Skin – Cost 2
Appearance: You form a thin membrane around your body, with invisible patches over your eyes and slits over any openings (such as a mouth).
Required Level: 12
Benefits: The membrane is unusually slick and malleable, granting you a +1 bonus to escape artist checks. The slits can be opened or closed as a free action. You can form multiple skins around yourself with every 2 skins granting a +1 bonus to natural armor that stacks with any preexisting natural armor.
Iron Skin: Additional cost 2:
Your skin is rough instead of slick, granting DR 1/adamantine instead of a bonus to escape artist checks. This benefit stacks with other Iron Skins.
Nourishing Skin: Additional cost 2
Your skin allows you to breathe a gas or liquid of your choice. This allows you to survive in materials that are usually poisonous, but it does not allow you to ignore other effects (the heat of lava, exploding methane, etc).
Special: Using a Nourishing skin for 1 hour counts as both eating a pound of food and drinking a gallon of water for the purposes of avoiding starvation and dehydration.
Energy Consuming Skin: Additional cost 3
Your skin grants resistance 5 to the elemental energy type of your choice (Fire, Cold, Acid, Electricity, or Sonic). Multiple Energy Consuming skins stack.
Special: Every 50 points of energy damage negated counts as both eating a pound of food and drinking a gallon of water for the purposes of avoiding starvation and dehydration. A fire consuming skin renders you immune to heat-based environmental effects that deal nonlethal damage, and a cold consuming skin renders you immune to cold-based environmental effects that deal nonlethal damage.
Magic Eating Skin: Additional cost 3
Required Level 13: Your skin can absorb magic itself. The Ozodrin gains Spell resistance 10, or increases their current spell resistance by three.
Special: If a spell fails to overcome the spell resistance of an Ozodrin with this feature, the Ozodrin gains 5 x spell level temporary hit points. These temporary hit points do not stack with themselves. Eating 3 levels worth of spells counts as eating a pound of food and drinking a gallon of water for the purposes of avoiding starvation and dehydration.
Skin that Pretends: Additional Cost 5
Required Level 14: Your skin changes color and stiffness in order to mimic the effects of the disguise self spell. Unlike the spell you cannot appear to be something smaller than you are, the Skin that Pretends counts as a mundane disguise once formed (it is not defeated by true seeing), and you can fake a body type other than your own by accepting a -20 penalty to the disguise check [extra bits are non-functional unless you use other features to mimic them]. Alternately, you can create a skin that blends into your surroundings like a chameleon. This use of the skin grants you a racial bonus to hide checks equal to your class level. You can choose for only part of your body to be hidden. This skin does not effect objects you are holding such as a sword, although it can cover stationary objects on your person such as clothing or jewelry.
Special: You may only have one Skin that Pretends active at a time. You can switch between multiple Skins the Pretend as a swift action. Other abilities possessed by the skins are not effected.
Warp Skin: Additional cost 8
Required Level 15: This skin forms a dimensional pocket, allowing its size to be unrelated to your own. A layer of this skin either increases or decreases your size category by one. Your ability scores and the size of other features are not modified, but all other modifiers apply. This benefit stacks with other Warp Skins, up to a maximum size of colossal and a minimum size of tiny.
Special: An Ozodrin with at least one layer of this skin is immune to atmospheric pressure effects. You may choose to create a version of this skin that does not change your size category.
Secreting skin: Additional cost 2
Required Level 16: You skin secretes a deadly liquid that dissolves, ignites, or freezes your foes. Each layer of this skin adds 1 point of acid, fire, or cold damage to all of your natural attacks (choose one when forming the skin). This damage is also dealt to any creature that comes into contact with your skin, either by grappling or by using a natural weapon. This damage does not effect nonliving material, but it does effect undead. You can add this augment to the same skin multiple times, and multiple Secreting skins stack with each other.
Healing Skin: Additional cost 8
Required Level 17: This skin uses your nourishment to repair the flesh beneath. You heal 10 hit points per pound of food consumed, up to a maximum of 10 hit points healed per round. Living creatures that you devour count towards this ability. If the weight of an enemy is unknown, assume that a medium bipedal creature contains 100lbs of meat and use carrying capacity modifiers to determine the weight of larger or smaller creatures. Multiple healing skins do not stack with each other, except that the maximum number of hit points healed per round is equal to 5 x the number of healing skins the Ozodrin has formed (You do not gain additional hit points per pound of food consumed).
Reality Warping Skin: Additional cost 10
Required Level 18: This skin slightly alters reality around itself, creating 1 inch emanation around yourself. This emanation allows you to selectively ignore the alignment and magic traits of various planes, but only within one inch of your body. For example, a special eye used in a dead magic zone would fail to function as normal unless the target was within 1 inch of it. This ability also applies to antimagic and energy transformation fields regardless of source. Creatures inside your stomach also receive this benefit. This augment does not stack with other reality warping skins.
Special: This skin allows you to survive in non-Euclidean realities.
-Perhaps the ability to leave puppets outside while hiding in their dimensional pocket.
Other suggested changes(you weren't clear whether you wanted to add these or not, but I included these nonetheless.):
SpoilerShowStomach: Cost - 10
Appearance: Stomachs appear as fleshy sacs inside the Ozodrin,
Required Level: 14
Benefits: Stomachs can be useful tools to an Ozodrin who likes eating things(or people). Any mouth can lead to any stomach, chosen when the mouth is created. A stomach has all the benefits described in Swallow Whole. You have one stomach automatically, which cannot be removed or sold for form points. Anything in a stomach that is removed is either pushed through an opening or is placed in a square next to the Ozodrin. You may apply or remove augments to a stomach after it has been created as a move action.
Stomach of Steel: Additional cost 3
The hardness of this stomach is increased by 5. You can add this augment multiple times to the same stomach.
Resistant Innards: Additional cost 3
The walls of your stomach gain energy resistance 10 to the energy type of your choice. You can add this augment multiple times to the same stomach. Its effects stack.
Dimensional Trap: Additional cost 4
Teleportation effects do not function within the stomach. This includes plane shift and similar effects.
Membranous Construction: Additional cost 1
Required Level 15: You can create an object in your stomach. This augment functions like wall of stone, except that the object is made out of your flesh instead of stone, fuses with surrounding flesh, and only creates 5 cubic feet worth of material. This flesh has the same hardness and energy resistances as the rest of the stomach. This augment can be added to the same stomach multiple times.
Might not work now that I know how stomach size works
Sticky Stomach: Additional cost 5
Required Level 16: Flight spells do not work inside your stomach. Additionally, creatures that come into contact with your stomach walls, floor, or ceiling must succeed on a DC 10 + ½ your class level + your charisma modifier strength check or else be entangled for 1 round per Sticky Stomach augment applied to the same stomach. The DC to climb out of your throat increases by 10. This augment can be added to the same stomach multiple times.
Warped Stomach: Additional cost 5
Required Level 17: Your stomach can be of any shape or size provided that its volume remains the same. This augment cannot be applied to a preexisting stomach. If a creature would not be able to fit inside your stomach, the walls slightly expand around it. A creature in such a stomach can only use a light slashing or piercing weapon to cut its way out.
Might not work now that I know how stomach size works
Massive Stomach: Additional cost 5
Required Level 17: The volume of your stomach increases by 100% of its original size. This augment can be applied multiple times, but it cannot be applied to a preexisting stomach.
Digesting Liquid: Additional cost 3
Required Level 18: All creatures and objects inside your stomach take 5 points of either acid, cold, fire, or electricity damage – chosen when you add this augment. A creature may make a reflex save against a DC of 10 + ½ your class level + your charisma modifier to take half damage. You may apply this augment to the same stomach multiple times, each creature only makes one saving throw per energy type (for example, if you applied this augment twice to deal 10 fire damage each creature would only make one saving throw in an attempt to take 5 damage instead).
Inner Universe: Additional cost 10
Required Level 19: You may apply any one elemental or Magic planar trait to the stomach except for the enhanced magic trait. This trait does not effect you, but it does effect any other creatures in your stomach. It costs an additional 20 form points to apply the major positive, major negative, limited magic, or dead magic planar traits. You may apply this augment to the same stomach multiple times, but only once for each kind of trait (Elemental and Magical).
Monster Within: Additional cost 10
Required Level 20: The walls of your stomach function as though they were a mirror of opposition. You may choose to suppress or resume this ability as a free action, although you have no control over any created duplicates. The duplicate ceases to exist if either they or the original leave the stomach. This augment functions any number of times per day, but only one duplicate can be in existence at a time for any given opponent.Advanced Form: An Ozodrin of 17th level or higher can add or remove a number of features equal to half her charisma modifier (minimum 4) as a full-round action. Basic Eyes only count as ½ a feature for the purposes of this restriction. Furthermore, an Ozodrin that uses a move action or a standard action to remove a feature may add/remove two features instead. The form points spent on a removed feature do not count against the point limit of a feature added at the same time.
Hope that's an OK enough list. The italics are obviously things you said.