It's an odd (non-square) shape, but you know that. I have the OEM board in the garage, and can post a picture if that helps. I'm trying to figure out a good way to measure the angles for you now. Here are the overall dimensions: Top (L-R): 36.25" Left side (T-B): 22" Right side: (T-B): 19.25" Bottom (L-R): 36.25" Bottom left half, edge to "peak": 14.25" Bottom right half, edge to "peak": 22.75" I got as close as I could, but the carpet is still on the board so all measurements are +/- .25". My c