for the ratchet, you could disassemble the rear sprocket of a 10-speed. Those are very low friction ratchets and would work nicely.
I know about the standard way, but I hate doing things normally
When we had to build those CO2 powered cars in industrial tech, everyone built something that looked like an older Indy car. I whittled mine into a sharp point, with the forward 2.5 inches being about as big around as a pencil. Weighed almost nothing and had great aerodynamics. Beat the HELL out of any car it challenged until one race, when it went a little too fast and smacked the barrier at the end of the track. Snapped in half. I think I hold the record as the only guy to ever crack the frame on a wooden CO2 car
