Relieved to hear that someone else didn't quite understand the question being asked.
Mini-nucs are usually used to get virgin queens mated, and nucs are used to initially 'grow' a small colony - i.e. these boxes are used for quite different purposes, and in my experience it's not usual practice to transfer one over to the other as they have different sized frames.
There is one notable exception to this, and that is the system used by Mike Palmer. Mike has developed a system using half-sized nuc boxes having two configurations. One configuration has normal-sized frames running lengthwise, with the other configuration having frames running transversely - i.e. across the box. In the latter case, the frames are of course much smaller, around half the length of a normal frame. Because the two configurations live in boxes having identical footprints, they can be very easily placed one above the other ... so, for example, a box of bare mating-nuc frames could be easily drawn-out by placing them above an occupied nuc box, and at the end of the season any remaining brood and stores in those mating-nuc frames could be absorbed into a nuc by placing that box underneath it. (Mike doesn't actually do this - but it's what I'll be doing myself later-on this year) A very clever set-up.
Indeed, it's possible to convert the mating-nuc version of the half-sized nuc box into two separate mating nucs by simply inserting a suitable division board. Mike has developed a double-sided feeder which acts as a division board, which can also be moved to one end of the box in order to provide double the space as the nuc begins to grow. All-in-all a very flexible system. If you're planning on making your own kit anyway, then this is a system well-worth considering. There are a couple of YouTube videos showing Mike's system in action, if you Google "Michael Palmer Sustainable Apiary".
LJ
