Hi
funny you had the same Ideas than I had
Mine is about the same stage than yours!
Yet I allready think I solved the engine Issue.
I will use am mini-z motormount and drive as a middle diff
As U joints I will use graupner boat stuff - and a single Ujoint per axle - and the shaft will also be part of the axle linkage.
So my first go won't have dual motors.
would like to stay in touch with you - btw do you know killers work from the TTTT forum - on this site? - you should really study it.