I checked prices on Delrin, some is quite expensive but did find a supplier about 1/2 the cost that was on ebay, but who knows what shipping is. My dad and brother work with bullet resistant plastic for banks but the sheet good, I don't think I've seen any over 1-1/2", the Delrin is available in 2" at a descent cost. Does it mill on a lathe and drill like normal plastic or does it have some qualities that make it hard to work with because of hardness?
“The pessimist complains about the wind. The optimist expects it to change. The leader adjusts the sails.” -John Maxwell