I knew you had a build somewhere finally found it. Heres my similer build I did over a year ago called it the Silverback named it aftere the infamouse Rasorback that robin made 12 of.
Thought about doing the center diff mod but the revo spec tranny fits in there so perfect and since I really dont race I figure why bother. I removed and sold the racerx suspension and I am going to run a mono with rpm trutrac suspension. It should be the same wheelbase as yours for the price of a mono.