The custom TC4 I've been working on, is mainly around the chassis. I've built a custom chassis that is very narrow and slightly shorter, specs below:

• Wheelbase: 250mm
• Track width: 190mm
• Chassis length: 300mm
• Chassis width: 106mm
• Chassis thickness: 3.4mm 100% Carbon fiber (Made of 2 layers of 1.7mm, top layer has cut-outs for servo, motor, battery - allow lower center of gravity)
• Overall length: 345mm
• Drivetrain: TC4/TC3 differentials
• Main Shaft: Tamiya TT-01 Aluminium (allows the 10mm shorter wheelbase)
• Steering: TC4 bell crank style steering