Here is my E-Revo conversion. It has gone thru several updates (motors, batteries, placement of parts, etc.). I bought a Revo 3.3 roller and added a custom motor mount, custom motor clamp (to keep the Feigao motor together), custom battery tray. It has a FOC, uses the mechanical disc brake, Feigao 9L motor, MM ESC with fan, UBEC, Tekno extended a-arms, carbon fiber rear brace/ESC mount. I had a center diff and rear brake but I took it off and added it to my big block Revo project. I was running a Novak 4.5HV system but the Feigao performance is better. I had side saddle battery trays but decided to go with a single, it is made of a alloy plate bolted to the chassis and there is a cross brace on the bottom to make it rock solid. Using a TrueRC 4s2p lipo 8000mah battery and this thing is fast, faster than the nitro 3.3. Even with the extended wheelbase I can wheelie pretty much any time. Surprisingly, even with the battery on one side it flys very straight.