Checked around the Apideas earlier this evening and have about 18 queens laying.
I have ten Paynes poly nucs set up as mating nucs as well with a single frame of bees and brood between the wall and an insulated dummy board.
There is a frame of stores on the other side of the dummy board.
One of these I set up 2 weeks ago with a ripe queen cell now has a laying queen.
I reckon these will make decent enough mating nucs.
You start with a frame of bees and brood and keep closed up until the queen has emerged, same as with apideas.
Once the brood has emerged you have about 2 frames of bees. When most of the brood has emerged you can move the frame of stores alongside so you now have a 2 frame nuc.
When the queen starts to lay, after a few days you swap the 2 frames of eggs/larvae for 2 frames of sealed brood and you should have a 5 frame nuc about 2 weeks later when the brood has emerged.