Wonderful thread! if I may, add just a tiny tid bit. I use the little sheet metal clip to install 2 or 4 half frames into the full frame box. It requires a full frame on each side to support the center clip but works very well in both 5 frame nucs and full size hives. I have also used medium half frames in full length boxes and the bees just build the comb on down to full length. When I go back to medium, I just cut the bottom comb off and they are once more medium length. The clips are easy to make with a pair of pliers and a bit of thin sheet metal.
I hope this thread does not die. It has been very helpful for me except for the "mind expanding pain" associated with learning something new and valuable. Thanx LP