Rather than complicating the snelgrove board, why not take several frames with the resulting cells and make them into separate mating nucs. Those will not need the diversion doors as you will want to keep the foragers as they develop. They could be placed above the box that was elevated above the Snelgrove board.That was one of my thoughts Frank. I keep getting stuck on the doors also. The board would have to be re designed with a division as well as sets of doors on each side. I wonder if the division board has a hole with qe covering it if that would allow equalization of the brood chambers so they are basically divided but act as one. I know people run 2 nucs with common supers above with no fighting.
I have a small apiary because it has to be protected by an electric fence. It gets crowded in swarm and split season so I like the space saving aspects of the SB. J