Simple R/C chassis

Just a simple R/C chassis that uses as few parts as possible, while maintaining a decent top speed, and easy control. The entire thing can b printed in PLA. 

Hardware needed:
-M3x20 screws x12
-M3 nuts
-5x16x5 bearings x4
-M3 hex shaft(at least 50mm long)
-M4x20 screw x2
-M4 nuts x2
-small plastic screw x1
-weight(optional, but recommended for better handling)
-hot glue
-micro servo x1
-370 brushed(or brushless) dc motor
-motor ESC rated for your motor
-7.4V Li-Po battery rated for your motor/ESC
-2.4Gz radio transmitter
-2.4Gz radio receiver
-LEGO tires x4
-silicone grease(optional)