I have seen the sun "sails" in several lanais over the years.
The only problem I see could be positioning for effect as sun moves. Secondly if in a location where breezes/winds are prevalent, the flopping around of the sails compromise the job intended for them to do.
I would vote against enclosing the top of the bird cage as it most certainly will trap the wind(s) instead of flowing through....hence pressure....possible damage.
All reasons given are why we opted to not do any of the above.
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