I did an enclosed pool in my last house. Used a galvanized metal frame from a company called versatube. You can buy the frame only. Then used triple wall bronze polycarbonate sheets for the roof. Had a better snow load rating than the roof of my house in MA. The sides were only meant to be temporary but ended up being semi-permanent but was a twin wall poly something greenhouse covering. The building never had much of a condensation problem that a couple of windows didn't take care of. It was nice to be able to use the pool from march to december. We heated it also but only at the start and end of the season. Could have kept it open year round but it was costly to heat when it was real cold.
Here's a picture before we put some windows in.
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