I wonder if expansion and contraction would be an issue with temperature changes? When I worked in automotive we used a lot of UHMW which was very durable and easy to work with. I have never bought it but have been told it is expensive.
https://en.wikipedia.org/wiki/Ultra-high-molecular-weight_polyethylene

Mark


1952 GMC 9430 one ton pickup, a work in progress

1952 1-ton pictures on Photobucket