A little update, I finished it. The Slash driveshafts fit better than stock's. Bolted the gearbox to the chassis and all feels stiffer. I'm waiting for a B4 idler to do a 4th conversion(On dirt, I've noticed that it don't have the traction it had before.
Other stuff I'm waiting: A set of traxxas rims for the front, a set of Proline Gladiators M3 and battery straps
Only needs team decals and maybe the wing
For the rear section, my first idea was using aluminium but a sheet of plastic would be nice. Only don't know which one, Delrin, maybe? carbon fiber is awesome but I'm afraid it snaps