The center portion of the sign would be a giant oval but we didn't need the whole thing as the bottom would be tucked into a themed base and the top would be in the canopy of the tree. By cutting these off we would save a lot of Precision Board, an important consideration as this portion of the sign would be a whopping fourteen inches thick. The centre oval would be a concave dome and routed from 4" thick precision Board. Because we were cutting the top and bottom off the oval we could get both pieces out of the same sheet. We would build the reliefs in four pieces. First we created a four inch flat relief, the thickness of our board.