I purchased a 6 1/4″ frame with plastic-cell foundation, from Murdoch’s, and cut out the foundation. I got two paint stir sticks and cut them to length (one is not long enough), and also cut them down, lengthwise, to the width of a craft stick. I glued these two pieces into the groove of the frame (it was a grooved top frame) and marked it with an “FL” for “foundationless.”
I put this in the top box in place of one of the plastic-cell foundation frames. This is a medium depth box and is the second box that is sitting right on top of the original deep brood box.
I plan to check on this when I swap out the white medium box for the cypress medium box I ordered from Kelley Beekeeping.