Thank You Ernie!
I should have taken the time to look further down through that pdf... the nuc that I am referring to is pictured a few pages down from page 17 that Ernie listed
it turns out that this mating nuc is called: Einwabenkästchen (EWK)
outside dimensions 26cm x 24cm x 6cm, it has a small feeder area and a single frame.
I found a description of it from a uk newsletter here
(see page 5)
Also cool looking :the combo top bar mating hives pictured in this newsletter
I am not so much interested in these as an observation hive, but a mating nuc that will use up the smallest possible amount of resources. I think that it is also a VERY great idea to be able to check on the queen's progress (glass/ plexi sides) without disturbing the hive.
also I found reference to this book: Bernhard Möbus, “Mating in Miniature: the Rationale, Design and Use of Mininucs ” anyone have access to this? (uk?)