Hello once again guys! Just wanted to share and maybe get some feedback on my design for my frame/hull. The frame is made from 1/2" PVC and the hull is 4" PVC. The hull has a threaded cap on one end and a flange on the other. A piece of plastic will be bolted against the flange with a gasket between.
The whole thing is about 20" long, 12" high and 15" wide. What kind of weight/floatation do you think I would need if the frame is water filled and the hull is air filled? Also, can I get some feedback on the window that I made? I kinda just thought of it haha...

In addition I just realized I have no plans for lighting. Do you think I should have an external light, or keep it safe in the hull? Thanks for any help!