Finished!!!! (for now)

Here's the completed chassis with rider attached, all wires hooked up and gear cover visible

The rider in the leaning position, preparing to make a turn

Close-up of the gear cover installed

Due to the sudden torque delivered by the motor, the clutch ring kept on detaching from the main shaft (due to the glue's bond being overwhelmed), disengaging the transmission frequency. Therefore, the yellow spur gear is now simply glued to the drive shaft altogether.