Trestle boards are board where things such as blueprints and designs are placed and hanged. Back in junior high, our class did something like this when making our float. Everyone contributed by placing their designs there, it was incredibly fun and effective. Providing the students with the information is incredibly important, it lets them be creative and innovative. What you are doing, is pretty good in my opinion. Giving them downloadable copies through the internet is pretty handy. It saves them the time of actually going there.