Well I see I didn't read carefully enough. I have also done a medium in the 3/8 exterior sheath, and here is the sketchup I did for that:http://capnchkn.no-ip.org/sketchup/dcoates5fmednuc.skp
I was thinking maybe to cover the exterior with some styrofoam, but haven't had the need yet. One cool thing about these nucs is you can stack them, assuming attached bottoms, with the entrances staggered front back. The touching sides and bottoms of the boxes will insulate each other, and I tried to make measurements so I could put a telescoping cover on top.
One problem, top ventilation. I've also placed vents on the sides of some, they get in the way more than do the job, and placed in the ends will just expose your fingers to nervous bees.