Sliding d shafts can be salvaged from a variety of cars and found on ebay. John, start a build diary....
Yes spindle mounted aluminum wheels are allowed, but magnesium wheels are not.
It looked like you have a single bar over your helmet, split that into 2 bars and you will gain head space. Plate over them and you head will be better protected.
If you can find a center load rack, it will allow longer tie rods... good luck with your build.