what i did to my box stand was when i cut out the slots, i turned around and used them as frames for the plexi.
i bought plexi for 3cents an sq. inch. cut me some small wood pieces and screwed them to the frame acting as glass holders.
then of course as others did, hinge it and use a screw/string to tie them up when you want it open.
it sure the hell is a lot warmer, as opposed to having open slots. makes no sense to freeze your arse off for nothing.
might as well do it right and not half assed after you put all that work in....
This post was edited on 1/6 at 12:40 pm