What about Lexan or Plexiglass?

I think it would make good mounting blocks, wondering if it will hold up to the abuse a boat takes?

BTW
It has snowed, rained or been below freezing every weekend since I started this project. So I have not done anything since the first weekend! I am so fed up with this weather and the 10 day forcast says it is going to rain next weekend too!

Arrrrghhh