The best way I can describe mine are like a tiny table. The edge should be slightly overhanging, so when the carpet is glued on after installing the pedestal mount, it will butt flush against the locker doors without being too tight. The front legs toward the bow were a hair shorter than the rear legs to adjust for the taper of the deck floor. Just measure all your distances and be sure to include your aluminum thickness when figuring height/length. The carpet is the last thing to do and it won't affect any measurements enough to be a concern. Using vibration isolators for the feet at the bottom of the legs is a great advantage also. They'll absorb shock from hopping up and off the insert and keep your deck from getting marred. Add them (compressed thickness) to your measurments if you decide to use them. Good luck!