3rd wall done! I can finally focus on hanging stuff where I actually want it and not just where it's out of the way.
Still touching up the front little sections to either side of the garage door and still have to do the ceiling, but...it's pretty much 90% done at this point.
Planning on adding an air duct + temp sensor controlled in-line fan to the ceiling.
Something like this:
https://www.amazon.com/AC-Infinity-R.../dp/B0792QR5YT
Only problem is I'm not sure that will be sufficient airflow so I may need something more powerful or add an exhaust fan as well. I'm trying to avoid anything where I'd have to cut through the drywall and such for future maintenance.