Awesome mount, Crick! Perfect way to showcase that deer for years to come. Did you just apply the glue/water to the tray and sprinkle in the "dirt?"
What you want to do is use some foam first glued together to build even or past base edges like I did. trim the edges back some so you can tuck in dirt. (never put on just wood) it WILL warp from all the moisture. very important,,,paint foam black first so if your dirt cracks you wont see the foam color, I used the pink foam sheeting. Use one bottle of glue at a time, squeeze it into mixing container and refill the bottle with water and dump in 50% 50% mix. start adding redried coffee grounds leaf litter, peat moss and pine needles. you can use just pete moss or just coffee grounds if you want or no needles, just what ever you desire. mix until water is not runny, about like thin peanut butter and simply start needing it on about 1/4" thick. I pit a fan on mine to sped up dry time or it will take about three days to dry hard. hope that helped
Good stuff buddy. The main idea I had was integrating the sheds into the display somehow... since hardly nobody has the previous year's sheds from their buck-of-a-lifetime! You done good, bro!