Im usually an out of the box thinker, but the only belt system that really makes any sense and to be a radical departure from todays TC's is a JRXS/JRXS-R set-up. The type - r only came to be because they used the rotation force of the motor to help produce more rear grip. But with brushless motors the motor in the middle would work great and with low pro-servos the norm in racing, space is a non-issue. Due to ROAR rules, the car will have to accept iether a full size lipo or a saddle. It cant be designed around a shorty or square pack. But it could be made to where that is the optimal battery. Short servo, motor, esc/rx, then shorty batt... all down the middle. A three belt design as in the 22-4 isnt likely as the more belts you have the less efficient the drive system.