I'd really just dump the omni drive system and go conventional with 2wd. You've got enough of a pain in the arse building a ring spinner powered by brushless motors.
I don't think it's going to be that bad. I would rather try something completely off the wall now and if it doesn't work great then go to 2wd for the next series. (Also we need something academically interesting for the university to help fund it.)
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