Axles would not be hard, I would do like the older corvettes did and instead of the small shaft make two driveshafts to go from the rear end to the tires. More then strong enough only downside there would just b 4 grease fittings to maintain (fine with me) which would u rather have a 1" shaft on small u joints or a 2.5"-3" tube with bigger u joints?

I am thinking about changing to a single driveshaft instead of the double driveshaft we have now. Less resistance in the drive line.