A month of Sundays and the tongue box is almost done. Had some blue floor mat left over from under the mattress so I used it inside the box to protect the 1/8' plywood from thing bouncing around inside. Large hole is for the ultimate jack when in use, removed when not in use for a clean look of nothing hanging down while towing. The 4 smaller holes are for the u-bolts that secure the box to the tongue and hold the battery in place.