Cool. I was going to ask if you had luck with the subject. Let us know how it turns out, for sure. I've never tried blending yeasts for/in a primary ferment, but have stopped ferments and pitched Brett in secondaries. I've also blended beers to taste that were fermented with different primaries.
Back to the brewery! Give some thoughts on your combo tanks and, or versus, the bright tank. Can you or have you served from the combi tanks and bright tanks as well? I always liked the idea of serving from the like.
I'm in a similar situation. I'm lucky enough to have a detached garage, across the street from my house. It's two story garage, double high doors at lower entrance, and even a sub basement (so 3 stories). About 1800 sq Ft per floor. That side of the street is zoned commercial too. I've talked to the locals and no problem with brewery on premises. So I could take the slow road in building a pro shop in there, as funds are available. But finances and time are the issue. I've really enjoyed your build.