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?