I like your idea. Caps for me are like pieces/pawns in a chess map, making calculations and anticipating the enemy movement to win. But sadly this is gonna be really hard work to balance it.
IMO not worth the hassle.
But good Idea anyways. If you can make more elaborations on the other balance issues, i will definitely reconsider my stand.
BTW where would battle Cruisers fit in ? perhaps 70?