I haven't used sleds much but now have some pretty expensive wormy chestnut I don't want to waste. My project is 21" long and 9-3/4" wide and 3/4" thick. My question is in designer do i have to include the thickness of the sled? For example now with no sled it's 3/4" but when using a sled do i have to put 1.5" thickness in designer?