The hub carriers have 4 bolts that come out with the driveshafts (as you'll know lol). The full driveshaft can be slid through the back plate of the drum then into the diff, then the 4 bolts just tighten onto the roadster's uprights.
Once they're on the car, the hub nuts will be much easier to loosen.
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My Build Diary -
http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.