Maybe this detail will help someone. After cutting off the side rails, the fabric will be loose on the ends but can be tightened up by moving the white plastic edge clips to the inside of the first spring; it will clip on there and the seat will be taught again. Then angle iron was used on two sides and the back to form a framework bolted to the original metal pads. The one pad has to be halved and a new hole drilled for the angle iron (right side). Bar stool rubber ends then covered the cut off leg ends. The seat rests now on the front two legs and the bottom of the seatbelt mounts. The back legs are capped just for looks. Maybe the '29 cockpit is a little higher because I did not have to cut off the seat belt mounts and kept the original retracting seat belts. Simple angle iron extensions were then used to tie the seat from the large bolt in the seat belt mounts and a bolt on each side right down through the frame. I had to drill a second set of holes to move the seat slightly forward when I added the wooden tack rail.