Its simple to build. One plastic excluder and some scrap wood to put the sides together. In the picture it looks like he used a piece of plastic on the bottom and plastic on the two ends to hold it together. With this thing I wouldn’t have to punch out cells. Just cut a strip of wax foundation, wax it to the cell bar and let the bees pick what larva they want. Fat beeman has a box for commercial beekeepers but its to big for what I need it for. He calls it the queen cell timing box. Hes got a nice video up on you tube about it. I watched it 10 times already.