I have a customer that wants an arrow Head plaque used for a BASE for an euro mount. Problem is he wants a dirt circle in it with the skull laying kind of on its side with a coyote print in the dirt, like it was laying on the ground. He shot this buck and didn't find it before the coyotes did. I took a router and took the circle out (1/4) and made a water glue and peat moss. It grew mold and split the wood. What am I doing wrong???