Good idea on using 9. I will give it a try. The plastic frames have plastic foundations, I am not really happy with the plastic as I am not a big fan of the alleged chemical side effects with plastic. But who knows. It's worth a shot and I will order some wood frames when I need to swap out some. Thanks for the advice. Hopefully tomorrow I make the top, then make a post. I am planning on my next weekend, to move a wild hive into the box.