Looks like Lee Martin brought some of the Tamiya/TRF line over when working with Shin on this car...
I see a TRF511/503 with the motor closer to the center line..
... but with Yokomo's twist added from the BMAX-4
... now for the parts you can not see... it's either a belt to gear set up.. or more belts... which might be the case and now your looking at a 4 belt drive car..??