Beating this to death,
Keeping the FWD platform FWD is the easiest and fastest route. Using a motor on the end of an R200 IRS diff from say a Nissan 240SX, Subaru, etc. with custom halfshafts it would bolt right together. This could be mounted in the existing engine bay with fabbed mounts no less. These stock diffs can support up to about 300ft lbs fairly reliably and more with some aftermarket parts.
If you want (need) a trans, adapt the motor to the stock trans or a 2 speed transaxle for sand buggies. Most of these will support as much torque as you'll throw at them with electric.
Of course if you really want alot of work, converting a strict FWD platform to RWD is a good way to do it. If you can find a 4WD variant like the aforementioned DSM it makes the project much easier.
Even when price is not an object on a project, there is always a point at which it becomes an object. Plan wisely so you can make your goal.
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