Hey crazybear! Is this project still in the making?
Did anyone know that Briggs& Stratton made a full-sized hybrid using a 16hp engine? Crazy stuff. Directly coupled drive-line. Gas engine>one-way clutch>electric motor>cable clutch>4-speed transmission.
I envision the BL motor and Nitro engine sharing the same spur gear. The Nitro engine would have a remote electric start. Insert bizarre throttle/brake mix and viola! You'd have yourself one unique R/C car.