Why not something like this:
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http://www.dupont.com/safetyglass/lgn/stories/1811.html
Of course, for the greenhouse, the glass was made to let some UV rays in, but they can also make laminated glass that offers UV and thermal control. The glass could stack well when shipping it to Luna. *g*
LOL, I just thought of Scotty's plastic aluminimum idea.
Cheers,
Marcia
