Have been building my own screened bottom boards and hive bodies and supers. Now starting my inner covers with entrances and feeder holes and top covers. Prototype inner cover with entrance/exit. Top cover prototype sitting on top of inner cover with entrance. I want to be able to feed through the inner cover. I want to us the round piece of cut out as a plug for when I am not feedeing. Also trying to come up with a way I can use a screen instead of the plug when I need some extra ventilation. I am thinking of putting a screen over this hole on bottom side of board so when I remove the jar the bees stay in. Do you think the bees could still get to the food with the screen over the whole. The jar would sit on the screen. Finished product. with a medium super box. Now I can just add the top cover. Any suggestions/ improvments are welcome.