Woww!!!! I've an old RCM Mugen motor mount siting here, colecting dust, so i could use it for the rear mount, just make home made side plate to hold it firmly.
he only part that i will have to make will be the front diff mount
The only thing that i would like to see on your setup would be a mechanical brake system, to avoid to use the speed control to brake.

Could you tell me which center diff you use?? Mugen, ofna, Hot bodies, Kyosho???? And on your pics, i suppose that the ring gear is there just to the picture need!!! I suppose that you'll use a Kyosho plastic one?