Here are some additional photos and dimensions that can be used to build your own transition ramp or bridge. Pic #1 shows the details from one end. This bridge is built from the inside out. I’m going to give the inside dimensions as they are the most relevant. The thickness of the stock used will determine what the outside dimensions become. I think the subsequent photos make it fairly clear where adjustments will need to be made to accommodate the outside dimensions. If not, I'll try to help.

The length is 50". The inside width is 9 ½”, allowing ¼” on each side of the Panther’s tracks. The tread or decks are 2” wide. The decks are 1/8” luan plywood nailed to 1/2 “ X 1 ½” poplar sides forming an ‘L’. The cross ‘beams’ are 5/8”X ¾” poplar milled to a ‘T’ shape and nailed on 5” centers to the treads… see pic #2. The pads on each end are ¼” poplar milled on the underside at the appropriate approach angle, using a rasp. Make your two ‘L’s first forming the basic structure then glue & nail the beams to it. A brad gun is your friend here, but small screws will work fine also, if you don’t have a gun or don’t want to use brads.

After you’ve got the main structure complete, you can add the side supports. These are more 1/8” luan 2 ¾” wide with smaller vertical beams attached on 4” centers roughly as shown in pic 3. The beams can be either machined from a single piece as shown in pic #4 or made from two pieces glued up. You can also use just a single flat piece 1/8” X ½” glued a little closer together to simulate beam reinforcement. The supports are glued to the sides and a cap piece installed across both.

And there you have it. A coat of leftover house paint will form a good base for whatever topcoat you’d like to apply.

Cheers, Bob