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I see a lot of trouble with hub motors.
First off you are adding a lot of unsprung weight, that mass is also a precision part! if your brakes are to close they will rub while going around corners just from the flex in all of the parts in the wheel hub and axle, with brakes you get a slight rubbing between parts that are meant to rub, try this with a motor and you'll get metal on metal grinding right next to huge magnets, those magnets will also pick up metal grit off the road unless the motor is sealed, sealed motors weigh more and take up more space.
A solution that I see is slightly shorter drive shafts and inboard motors, even with a gear or chain reduction to allow the motor to be off set will not waste much energy compared to the energy wasted by having to have larger gaps in the motor to allow for the flex that is going to happen in a wheel hub motor.
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