We're actually looking at several different materials.

What we are most likely to settle on is a canvas phenolic board.

I love teflon... but have been told that PTFE is tough as the devil to machine. And I am not sure if it can be laser cut or not. Great dielectrics. Man, how I love this stuff, but it would also probably be too expensive for us to use and stay within budget.

PVC... nay... just not for me... wasn't even aware that you could get it in sheet form... but I guess ya can...

hope I've been somewhat helpful,

msl