Steve;
My pedals are probably not applicable to your application but I'll post a picture anyway, just to give someone an idea of how pedals could be fabricated. BTW, the toe hook on the gas pedal is not installed yet.
These are made of welded steel tubing and sheet. The support and pivot bearings are oddball surplus (naturally) aluminum pieces that are bolted to an aluminum plate. This whole thing is then riveted to an aluminum sheet that forms a heel support over the stressed aluminum panel on the bottom of my steel tube chassis.
Regards, Neil Tucson, AZ