How to make a DIY Hot Tub cover?

[@Prodigious82]

Pretty neat. One potential issue, aluminum will corrode in a humid environment when chlorine is present. May want to do something besides a foil layer.

[@leslieconner8557]

why don't we have a video instead of still pictures? How do you take it off and put it back on? You said it isn't heavy, but you don't show us that it isn't heavy or awkward to take it off and replace it.