[GarroH]

We like to use a lot of aluminum, like the teams that have responded above for many of the same reasons.

One of our favorite materials, especially in the past few years, has been HDPE. This is the material we made our shooter out of and we really love it. It is fairly easy to machine and deal with. Obviously, it's not good for structural elements, but it can come in handy for a lot.

Major downside is that it can sag under its own weight. We ran into this as our shooter began to droop towards the end of the season.

Just another material to look into.