We used this about a decade ago when helping run a queen rearing course. Its a derivative of the method followed by the NBU as written up by David Wilkinson and Mike Brown in the article linked at the bottom of the beebase page on queen rearing
Its quite straightforward, uses a normal production colony, can still produce honey that year, requires just your normal kit with just a couple of extra "fat" dummy boards (very easy to make with scrap timber or spare empty old frames). May not take every cell first time round but often better with a second batch and that allows other kit to be reused as well. Doesn't require lots of multiple hive reconfiguring to produce hundreds of cells the average hobbyist has absolutely no need for (its all very well these online videos of commercial producers with their bee porn strips of endless perfect grafted cells, but the average Joe doesn't even have enough kit to get 5 mated let alone 500). You can also move the cell rearing box up the stack to make checking easier without dismantling the whole thing. Personally I thought it better to initially put the cell rearing box above the first super (above the queen excluder), to ensure the separation necessary to encourage cell building
I do remember due to the time of year that the colony also tried to swarm in the box below - so don't forget normal inspections of the brood chamber whilst queen rearing is underway. And be sensible, don't use an already small colony to start with.
Got me thinking to try it again next year!