You can do a lot with plywood.
“When I tell people that I used to race bicycles, they sometimes confuse that with racing mountain bikes. No, I gently explain, mountain bike races are very different than road races. What I mean to say is that road racers are a little crazy, mountain bike racers are just plain crazy, then there are downhill mountain bike racers. To help explain, please view the attached video of a downhill mountain bike race.“ ~ Jim Westhoff