http://www.bushfarms.com/beesqueenrearing.htm#matingnucs
“Some queen-breeders use a very small hive with much smaller frames than their common ones for keeping their queens in till mated, but for several reasons I consider it best to have but the one frame in both the queen-rearing and the ordinary hives. In the first place, a nucleus colony can be formed in a few minutes from any hive by simply transferring two or three frames and the adhering bees from it to the nucleus hive. Then again, a nucleus colony can be built up at any time or united with another where the frames are all alike, with very little trouble. And lastly, we have only the one sized frames to make. I have always used a nucleus hive such as I have described, and would not care to use any other.”–Isaac Hopkins, The Australasian Bee Manual
“for the honey-producer there seems no great advantage in baby nuclei. He generally needs to make some increase, and it is more convenient for him to use 2 or 3-frame nuclei for queen-rearing, and then build them up into full colonies…I use a full hive for each nucleus, merely putting 3 or 4 frames in one side of the hive, with a dummy beside them. To be sure, it takes more bees than to have three nuclei in one hive, but it is a good bit more convenient to build up into a full colony a nucleus that has the whole hive to itself.”–C.C. Miller, Fifty Years Among the Bees
“The small Baby Nucleus hive had a run for a while but is now generally considered a mere passing fad. It is so small that the bees are put into an unnatural condition, and they therefore perform in an unnatural manner…I strongly advise a nucleus hive that will take the regular brood-frame that is used in your hives. The one that I use is a twin hive, each compartment large enough to hold two jumbo frames and a division-board.”–Smith, Queen Rearing Simplified
“I was convinced that the best nucleus that I could possibly have, was one or two frames in an ordinary hive. In this way all work done by the nucleus was readily available for the use of any colony, after I was through with the nucleus…take a frame of brood and one of honey, together with all of the adhering bees, being careful not to get the old Queen, and put the frames into a hive where you wish the nucleus to stand…drawing up the division-board so as to adjust the hive to the size of the colony.”–G. M. Doolittle, Scientific Queen-Rearing
“Where queen breeding is the prime object, the tendency is to use as small hives and as few bees as possible, so that the largest possible number of queens may be reared with the bees and equipment available. However, many of the most successful queen breeders find serious objections to baby nuclei and small mating boxes, and advocate nothing but standard frames for mating-hives.”–Frank Pellett, Practical Queen Rearing