[RC-Monster Mike]

The HPI super Nitro rally wheels have the standard 2.2 hex and also fit the 1/10 buggy rear tires - piece of cake. I used a dogbone from an Hpi rs4mt(rear wheel dogbone I think) and built the chassis to that length(this took some time deciding as well, as I wanted to use what I had laying around, and finding a body for something longer than the truck currently is seemed impossible). The steering was also tricky, but I ended up using the tc3 steering, mounted to the custom front skidplate.
The 4200 would work quite well, though it doesn't need that kind of power(since when is it about "need" though!). I settled for a 380 sized Feigao(cheaper and actually a little larger than the lehner basic motor). I actually had a center diff at first, as well as dual motors like the full sized e-maxx, but settled for the single motor in the center(plenty).
I was gonna update it this winter, but may try my luck at a mini electric revo instead! Of course it all depends on time and motivation! I do have a few projects that need to happen first! I can take some measurements if you like, to help you along. I could probably even cut a chassis to make it pretty easy.