Hi. A few months ago we had something similar in a nursing home where the Municipality demanded that it be closed with fireproof material. The most economical thing was to make frames with an iron L profile (1½ "frame and 1" windows) with visagras at the top. To open them we put some arms like the ones I leave on the link. For the enclosure you can use polycarbonate or glass, it is a matter of tastes and costs. The locks come from iron, aluminum, bronze, etc. regards http://www.comercialdelplatasrl.com/pagina/catalogo4.php?lis=2&idfamilia=01&idsubfamilia=C003&idrubro=60