Is it only me who has noticed the final stage of the Chipua drive 'copper' gear will fit perfectly into the FP gear box? I am not suggesting anyone do this, But using the design of the FP - perhaps using the plastic gears as templates or casts for aluminum? (Nothing in the rules about manufacturing your own gears.)

All that said we probably, will make our Chipua transmissions real simple, out of a worm gear reduction.

Also on the final stage teeth stripping on FP - this will happen in head to head pushing and shoving matches. Also the motors can get HOT in this situation - I suggest if you plan to use the FP as drive motors to take the plastic housing off, and direct some air on to them. Also don't drive the wheel directly off the plastic axle - use some sort of belt or chain drive to the final stage to avoid sharp sudden shocks to the gearbox.