Looks good! i took my Mbx5t out with some 40 series road rages with a castle 1515 on 6s geared for around 64. I think that's around the fastest i've run any of my kits. What kinda speeds are you going for in your setup?
I don't want to say im a hater of the Mt4-G3 but i hate seeing all the OMFG its the BEST BASHER EVUR! When in reality it has weaknesses just like any other rc. It's probably a really good kit, the price point for a rtr is good, but in my eyes it's not the end all be all. I have to stay away from RCU and the wonder tiger forums now because of all the favoritism, loyalty and one sided assumptions about other kits.

Anywho...I like how your going outside the box with this build and not the normal brace the chassis, buy a bunch of digi-dem parts, buy better hinge pins, add a summit bumper stuff