The part that I am planning when I put a rear drive in my metro is to modify the largest alternator I can find to put out 70 volts or so to charge the battery pack with the gas engine. That way if the car is able to drive on electric only once up to speed or whatever the gas motor could just be cycled on and off every so often just to charge the batteries. Then just use a single set of optima or similar batteries that can run the car for a few minutes at full load before needing recharged. Gives the car a lot of flexibility that way by charging it at home or on the road.
I am still looking into different rear drive setups though and if the voyager rear drivetrain is easy to find it might be worth looking into. I figure whatever I end up using I want something common and cheap to find replacement parts for.
If you do find a good awd voyager in a junkyard somewhere take lots of pics of it
