[frizzen]

Well it looks pretty cool.

But unfortunately, about all you really would have added with this would be a little more rotating mass, and extra friction. Unless you've got both wheels able to act independently, or had a problem with one side spinning before; I'm not really seeing how this would be much of a benefit over the old Dual Motor mod where you lowered the stock motor, and mount another meshed into stock the idler position. I mean, the solid steel axle rod does a pretty decent job of keeping torque matched between both rims.

But it's an original idea and looks cool!