Ok I have been carving some nice patterns and cutouts using sleds now I want to carve on an entire piece of wood say my piece is 12 inches long by 7 inches wide I am assuming that I need to add extra width as well as extra length how much do I add for width. And 1 more question say I want to carve a piece of wood that is 11 1/4 x11 1/4 and my sled is 24inches long by 11 1/4 wide can I use this sled or do I need to cut the sled down to 18 1/4 giving me that 7 inches that is needed for length