Your twin supercharger work is bang on for that setup - 4wd works it's butt off the best when theres power across the board - and given that you put some heavy duty gear in the diff/drivetrain to handle it - even a low boost will produce huge power - scaling as the engine revs higher.

REALLY well thought out - hope to see some videos of this some time soon, if done right it would truly be an animal.

WELL DONE.