Newbee here with a hive in NorCal where it's HOT (95+) and my bees are bearding like crazy every evening. I've put spacers in to raise the inner cover a bit (maybe 1/8 inch) and have removed the entrance reducer completely. I'm thinking about converting the existing bottom board to a makeshift screened board but am limited by availability of tools and equipment and it will be at least a few weeks before I could get a real SBB. I do have some old screen from a window and a skil saw - any problem in simply cutting out most of the bottom board (except maybe 3" on all sides) and stapling screen over the hole? I presume the screen should go on the top side.