great, I started making one, but never finished; now I dont need to :)

Very unusual setup, but I'm sure you had valid reasons for it.
2 questions:
- why blue rear springs?
-why so long rear camber link?

On that track it was good to have rear traction -> long link
There was also sharp bumps (very narrow length) and they tend to bottom rear and bounce it to air -> blue springs to hold the rear better..

in reality, I have driven on carpet last time something like year ago with 4wd...so I was quite "out" of the setup, used what Mark suggested....made some modifications. But car was fast, Finnish winterjumps is quite fast series.