This looks/sounds neat, I'll be happy to keep an ear out on how you're doing. The thing keeping me from anything more yet though: What's the ductless option like?

I don't have any ducts, just hydronic+baseboard heating currently (and a dual-hose portable AC unit for cooling). I'm looking at a mini-split setup, but that's a fairly daunting prospect for the issues you note with the existing market.