I'm thinking fiber glass.. That way everyone can cut what ever angles and lengths out of say a 22 foot molded piece to fit a raised roof or longer or shorter awning.. Also make sure the front pieces have lots of extra material so you can adjust to fit your coach.. I'm also considering aluminum but that may be harder to get a good fit with..we are meeting next week to get measurements .. Probly take a couple of weeks to get the molds right but once they are right it should be an easy install.. I just want them to be solid..and nice...really excited to get the rear spoiler mocked up.. And put an led brake light bar across it..