I have a friend who works poly pipe and plastic welding all day every day.He has built a jet boat three pontoon boats (large ) and heaps of other stuff out of poly .His advice when we wanted to build one to replace our 4.2m inflatables was don't bother.Basically it would weigh three times as much as what we have.
You can buy meet at a supermarket too.
I've cut some strips and filler rods to test out and see how it goes.
There are only three types of people in this world. Those that can count, and those that can't!
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