Michael, thanks for those comments. When I looked at the DE, the very first thought that went through my head was: "Wow, a ventilated BS National! How unique." This, after pouring through Dave Cushman's site.
I am beginning to think I may wind up making my own 19 7/8-in square (12-frame Langstroth, essentially), all medium-depth, top-entrance, insulated migratory lid, skirted and screened bottom-board hives with custom false winter-exterior to provide dead-space insulation. Yikes, what a mouthful. That's enough buzz-words to choke a cat. It's also nearly 50 linear feet of 1x8 per hive even before accounting for honey supers, feeders and the like.