Jeremy,

Check Cabela's for the straps that you can use to secure your pontoons.I think they sell them in three different lenghts. Cut a piece of the strap material with the buckle portion and secure it to the outside portion of the frame. OSH sells sail cloth needles that you can use to sew the loop to the frame with buckle. The longer strap material can be sewn to the inside portion of the frame and looped underneath the pontoon and secured with the buckle. Hope this makes sense.