Jack, I'm in the process of replacing most of the interior fiberglass such as the floor, tunnel and foot boxes with 1" square tubing with aluminum panels. I also saved all of the fiberglass I cut out. The reason I did all this was to increase the amount of legroom. It was a bigger project that I expected, but aren't they all!! I live in Chandler, AZ if you want to see what i've done and take whatever measurements you need. I also have some pics I can share with you. You can give me a call on my cell 480-297-3400. Thanks, Damian