[JesseK]

Differentials
Some sort of adapter for the 6-hole standard pattern seen in FRC wheels such that smaller sprockets may be put on the wheels
Motor mounting plates for popular transmissions including the FP gearbox, BaneBots planetary, and a direct CIM, FP, or BB motor mount.
4" mecanum wheel

Rather than competing with AM on the product line that both Andy and Mark have spent years perfecting, I'd recommmend getting into the game by establishing a foothold in the market in a place they haven't yet explored or by offering a product that is truly superior by design. They're pretty good at doing quality wheels and transmissions, though maybe I'm biased.