Quoted from Freeplay40:
The actual forming is the fun easy part for me. The hard parts are making the molds (this one took me over a month to get just right) and the finishing.
Looks like you must have a real knack for it! Fun thread to read. Pinball needs you.
Others have mentioned the crossover ramp in Transporter The Rescue. It is an injection molded ramp. I see this on ebay, which is a whitewater ramp it says. If it can be vacuum formed, I bet you could do a transporter crossover. PM me if you want to check one out