I'm in MN. I live up in the sticks near Isanti, about 30 miles north of the cities.
I keep the standard langstroth setup right now. There is a lot of influence towards that here in and surrounding the metro. I think that is due to the Minnesota Hobby Beekeepers Association and their close affiliation with the BeeLab at the UofM. I like both of them and think they do good work but they do lean lean in favor of production models over all natural models.
I'm going into my third year as a beekeeper. It's looking very promising that my
bees will successfully over-winter this year. Last winter (my first) they did not. I've been treatment free the whole time but I cannot claim it was a conscious choice, especially on year one. It's more a product of being cheap (I don't want to buy treatments) and lazy (I never got the testing done). I did not even know one could go treatment free until last year at which time it became a conscious decision.
I started the conversion to foundationless last year. I'll probably stick to foundationless Langs for the next few years. My focus is more on staying treatment free and getting to
sustainable (no buying bees) than focusing on the form factor of the hive. Once I feel I've attained that, I'll probably start taking the swarms they produce and putting them in different hive styles. Warre is at the top of my list with Perone following a close second (the lazy factor of that hive just makes me giddy).
I've never built a warre but I have built a box and, essentially, that is all any vertical hive is. To build you own is not tough. This was part of Warre's methodology. It's intended to be very easy to build. But joints and easy angles. That said, if you are willing to sacrifice the premise of the inside dimension being a specific size, you can convert any Langstroth hive setup to Warre management style. You just only buy medium hive bodies and only use the top bar of the frame. In other words, don't let a fear of woodworking stop you. Buy Lang setups and do it that way.
I'm planning a field trip for people within driving distance of Hudson, WI to the apiary of someone I know through MHBA in March or April. He might not consider himself a
permie in the purest sense but his apiary has been treatment free and sustainable for the past 3 years. If you (or anyone else reading this) is interested, "Purple Moose" (PM) me and I'll keep you posted.