I got a white 1/4” fiber board from Hobby Lobby, small sheet of bubble insulation - cut insulation the size of internal opening and fiber board to the size of external skylight opening, then glued together. Used 4 small, waterproof command hooks on the plastic interior. The fiber board/ insulation slides into the command hooks when not
using shower and just slide it out when needed. Easy - going on two years with it.
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