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Message: <blockquote data-quote="PSG-1" data-source="post: 297415" data-attributes="member: 6937">You could probably use PVC pipe, the majority of the run down the gunwale is going to be straight. However, you might run into some issues when you get amidships, as the gunwale begins to curve toward the bow. You can see how we had to cut, notch, and weld to deal with that. You could possibly heat the PVC enough to make it pliable, and bend a gradual radius in it to make that curve, I'm not sure how that would work out.Your other issue would be how to make a system of being able to attach the tubes to the boat. Some type of brackets or clamps that will attach to the gunwales.Filling with foam would give you some added buoyancy in the event of the tube having a leak, or knocking a hole in it.I pressurized, because as long as there is positive pressure, you know there's not a leak, and therefore, no water being in the tube. As the photo shows, each tube had a PSI gauge that read up to 15PSI, and these gauges were located amidships, on the top of each sponson, where I could easily see them from my position at the helm.</blockquote>