Originally Posted by
Amnoriath
1. Astral Constructs, the health isn't really what bothers me. Remember those constructs become huge size with that base damage and they effectively competed with Uberchargers and/or martial initiators. So, the size factor alone restricted where you could grow them all the way. In 5e you don't nearly have those kind of damage numbers any more. If you get only a few upgrades you have what is equivalent to a Paladin's smite every attack. As for the AC keep in mind that it won't grow much at all from that and they have a shield which is at the expense of damage output. I also didn't factor in any possibilities for items, upgrades, or share spell type abilities.
2. You use your action to command them anyway and your attacks with a weapon aren't at all going to compare what your robot or even your gadgets do.
3. One I can think of right away is adding your proficiency bonus to any dexterity or intelligence based check dealing with mechanical objects. I also believe that the Encapsulate ability could be used as a subclass on its own. As for another maybe look towards being more gadget focused.