[Rinoa Super-Genius] shows us in a video how to build a crude motorized barrel boat using only a few parts, including pontoons for extra buoyancy and stabilisation.
Building a barrel boat is simple. All you really need is a plastic barrel, scrap wood, PVC pipe with end caps, a battery, and a trolling motor. Of course, you could go even further and build your own trolling motor too.
The video shows the process of building the boat. You start of by cutting the barrel in two, making some calculations of water displacement in order to add the pontoons in the correct positions. These are just held in place with scrap wood screwed into the barrel. Connect the trolling motor to a battery and you’re done.
This isn’t obviously the best looking DIY boat out there, nor does it claim to be, but it can be built on a tight budget. If you have the right parts lying around, you could even build it for free.