A couple of years ago, I needed a rooftop kayak rack and decided, for my infrequent need, that I wasn't willing to pay the price for a factory made rack. I designed and built a PVC rack that I have used very successfully for a couple of years now. It can be mounted on existing roof rails or mounted directly on the roof. I have posted the plans for the kayak rack and a PVC kayak cart on my website at http://projects.cadrefloorplans.com
. I'd appreciate hearing from anyone who builds either project.