My point with using the rear suspention from a 4 wheel drive VW is that more of it is more likely to line up and bolt on, but also keep in mind that the rear axle stubs of a VW rabbit bolt on, they are not welded on so you are not going to need to do any cutting of the axle stubs, but their bolt pattern is pretty small, maybe 3" with 4 bolts, it's been a while.
What I would do however is to buy a used rear swing arm, that way you can make your modifications to a rear swing arm that is not in a perfectly good car that if your project doesn't work out could be sold, otherwise you have a car that even tho you paid $300 for it is worth closer to $1,000 if it's in running condition.
to get a 10hp motor you are most likely going to need to go up to 72v or higher, look at the D&D motor web site, you might even write to them and ask about their custom wound motors and ask them what the lowest voltage for a 10hp motor is going to be but I suspect that no one will build one for you and that if you did get one built that you would need very large electrical cables going to it, 10hp at 12 volts is well over 600 amps... continues, go with 72v or 96 volts at they very least.
I would then be temped to graft on the rear end of something like the Honda WagoVan from the 1982-1985 as that had a solid rear axle for the rear wheel drive, then set it up like solectra did the Chevy S-10 conversions that they built and sold, with the motor sticking out the rear insted of sticking out the front, a very simple gear box or chain drive allows the motor to sit next to a very short drive shaft to allow for suspension travel without having the motor stick out the rear of the vehicle.
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