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Zmatt writes –

Inspired by the PVC KAYAK, I thought I could build one up making it differently with a simple design that I have used previously in a small 1.5 foot boat which I built out of Plexiglas. I also plan on attaching a trolling motor with 34lbs or thrust to the rear of the boat. I ended up with a 55lbs thrust motor for not much more than a 34lb. Another thing that I wanted to make better was adding a good surface to the bottom of the entire boat. (To make a good fishing platform) I looked at a hard foam that seemed to be very sturdy, and I have also thought of using a very thin piece of plywood or both.

instructables : Build Your Own PVC Johnboat for minimal cost and time – Link.