Not sure how mini
you’re looking for. I assume maybe you’re looking for half size frame designs?
I stumbled across a nice set of Golden Gopher plans (UofMinn) while surfing BeeHivejournal blogspot tonight. Here’s the link to the UMN design. http://www.tc.umn.edu/~reute001/Plan%20files/pMini%20Mating%20Nucs.pdf
They’ve got a drawing and materials list for a 3 frame and 4 frame mini nuc.