I've done the room correction portion a few times, but at the consumer level, meaning I used a lot of the "autotune" abilities instead of digging into an EQ myself band by band. For a Dirac or Audyssey autotune, it's really just a matter of getting the mic to the right positions (you want to do multiple positions bracketing your listening ear position to get the best results), and making sure the room is really the same way that you'll be listening to it (IE if you'll be sitting there, you sit there. If you'll have listeners with you most of the time, have people sit in those positions. If your blinds will be closed for movie viewing, shut the blinds!
For your speaker build and miniDSP, you really <really really> should join the DIY Loudspeaker Project Pad group on Facebook. Those guys go deep info crossover design and there's a ton of fabrication experience there too. This includes if you need to find a local CNC, sometimes you can post and find a local willing to help you out.
Also would be worth checking out the RTA in Cars FB group if you want to nerd out. Though it focuses on car environment, the DSP/EQ info in there for "cabin tuning" can directly apply to house room use. It's all about doing mic traces, time/phase alignment, and adjusting DSP. Some really great how-to in there that will walk you through from zero knowledge, just the desire to learn.