I converted a 9.5 a while ago and had some success running it until I burned up the 9918 esc. I figured I had an MT2 that was in good shape but needed a new engine so I might as well throw some electric stuff in it.
I have a 8 cell brick pack of IB3800 from CBP and will be my standard pack to use it with. It is a little overgeared 15/52. I would suggest a 13T for this kind of truck for racing or bashing. The slipper is locked down because if I set it correctly it loosens itself. The truck really spins all 4 on pavement and just looks like it floats over grass. I've never got any wheelies out of it, or oven bouncing wheelies, must be the heavy motor in front. Low speed control on grass is hard, it will always try to spin out when turning because of the higher gearing and higher power.
I tried to keep the chassis pretty well organized for the sake of less work taking stuff off and putting stuff on if I need to. The ubec sits right under the esc. The battery comes in and out really easily and locks right with a little electric tape (for now) in its aluminum holder. I made a front motor brace out of some aluminum sheet. You can see it right behind the pinion. It puts equal pressure on the motor plate and keeps the motor from moving.
It's fun to drive, I can't wait to wring it out on the track.
I'll will be running it in the open BL class at the RC monster bash. I look forward to seeing all the different custom BL cars that are going to race.