MyFishFinder.com Just like iceshanty but warmer
If you are talking about permy or drop down shack interior walls, I would recommend FRP panels. They are waterproof and easy to clean.
I’m building a drop down shack. I see a lot with tongue and groove cedar, some with plywood and didn’t know if it’s worth the money for cedar. I looked at the FRP panels and wondered if many used it?