I came up with something similar, independantly and quite by accident. At one time I acquired quite a bit of stainless steel woven belting. I only got into keeping bees last year. I'd watched the bees fanning the hives trying to get rid of heat and moisture during the hot humid summer months, so I figred more ventilation would help, but having seen a hive lost to moths, I knew better than to simply prop the top up. Since I had all of this "fine screen" available, I built a top frame from it for each of my hives, and then propped the telescope top up an inch or so to give the air somewhere to go and still keep the direct rain off. One hive coated it with propolis pretty quick, but has since cleaned much of that back off.