hi Al
If you have room for it (and want to pay the postage back to you
), I can probably find a piece of thick transparent polycarb at work (sometimes up to an inch thick). I have a lash-up circle cutter on my router.
I like your project and I'm happy to do it for nothing. If you want to put something in your own charity box or send me something for Christian Aid (who have one of those DFID donation-matching things on the go again at the moment) then so much the better.
cheers
Mark