Hi,
1. I'm often asked that question. I was going to make a drive hub but stumbled upon something stupidly simple which I really don't want to reveal at present as it's intellectual property as I do have plans of selling the wheels/parts.
Do doubt somebody will pick up the idea in due course and so be it.
If I don't get around to ever wanting to sell anything, then I will freely offer the info with details etc. no problems at all.
2. Yes, but for reasons above I don't really want to post them.
3. Front wheel hub has one rotor mount but another hub can be machined for the other side without much bother. I'm only going to run one rotor on mine.
4.The front rim can be made to fit any front end and the rear can be made to fit any rear end.