Nice.
I'm currently building this model. I'm planning on using the wide "euro-style" front wheels, as well as a custom paint.
Lots of options for these 1/14 scale trucks on Ebay. Metal axles, etc.
Have You tried a 55 turn motor? (Lathe motor)? More impressive scale speed, and power.
I tested it in KNIGHT HAULER, but the maximum speed became slow. It is effective to prevent a rollover. Because I do not find the speed in KNIGHT HAULER, I think that it is good choice. But I am anxious about the durability of the speed control unit in the load of the motor.