I would suggest telling them about white plastic and flat white paint, since its so much cheaper than Mylar, and a simple wood frame, or closet walls ... I have two very good suppliers:

lights, mylar, light setups, all sorts of growing supplies here: http://www.hydroponics.net/items/

and bulbs, fixtures etc. here: http://www.1000bulbs.com/category.ph...ogen&HBX_OU=50
the image reaper Reviewed by the image reaper on . my newest cabinet ... this is my 3rd grow-booth I've built over the years ... still using 2' x 4' x 6.5' dimensions ... built to fit neatly into the corner of a travel trailer ... fully lined with 2mil Mylar, ventilation fans, and central heat/air in room ... I'm running Eight 40-watt 4-ft. flouros for the canopy, using GE Cool White (6500K) for growth, and will switch to GE Kitchen and Bath (3000K) for flowering ... I also have eight more units for possible placement from beneath during flowering ... will provide Rating: 5