I saw it on tv once. They had one guy paddle a canoe and the guy in the back had four foot poles. He would bend the rice inside the canoe and hit it into a blanket on the bottom.
Let's build a machine then we can get more.
600 min.
Check your foam to see if it will hold water. If not you could reuse. Use normal good one side ply and paint it. Homedepot has boat vinyl. Hatches ain't cheap shop around.
It would be aprox 300. For hook up and power vent install.
I like Power vent on hot water. I have not had any prob with mine.
You need the white pipes.