My current problem though is figuring out what to put into the blank spaces especially near the end. I do appreciate your suggestions though but as I said I am not using the exact xcom classes because some things only work that well in a video game.
I also need an idea for what to put onto marksmanship snipers signature ability. I'm debating between a full-round action to force crits on a single attack, a virtual strike like effect that scales with level, or a huge level based damage bonus (like studied combat but for a single attack) the point has to be for snipers, all or nothing. 1 attack is better than 4 more, always.