Here you can see my design for a 4x5 nuc, that's four five frame nucs in one box. The last thing to add is the dividers.
Finally, here is evidence that given the opportunity, bees will size the entrance how they want it.
Another hive on this pallet seems to me to be burning too brightly. By that I mean they are too big and using their stores too fast. I hope they can slow it down and last the winter. On the other hand, they are a bit mean, and with that in mind, I doubt I would breed from them.