Hmm I will have to look into those.
Got the E4 parts today. I got an amazing deal for $55 shipped. I just have to get a rear E4 diff for it though. The e4 rear end is going to work great on this. The width of the hinge pins is slightly less than the B4. I was able to fit stock b4 a-arms on but the spur gear would hit the front of the a-arm with out modification so it looks like I will definatly have to make new a-arms. I was worried that I would have to make the wheelbase longer because of the lack of the room for the saddle pack but it looks like their will be plenty of room. I'm going to start drawing up the chassis and then I'll make a mock up chassis before I cut it out of some nice carbon. I feel like I almost need to figure out how to make a slipper clutch for this to get that out of the way though becuase thats one of the major hurdles I have to clear. I'll see what I can master mind.
After getting the E4 aluminum parts I have the feeling this is going to end up a sort of "luxury" buggy .
Here are some pictures..