Garage Remodel #1: cutting into drywall for romex path

well, i jotted down what i need to do in my garage in order to i know what needs to get down. I was starting to get overwhelmed with everything. so much to do in this garage as it presently is bare bones drywall and structure lumber. and thought it would clear my mind knowing what order to do what. I removed the finished ceiling to get access to rafters for some projects last year. Of course now, I realized i should not of done that, but oh well… will give me practice on installing fire rated gypsum drywall. But before I install the drywall:

1.) add 2×4 bracing for 5 locations in ceiling for ceiling access hatches (future wire pulls, maintenance, etc).
2.) run voice / data (all with be CAT6 as that is my day job) / audio and video / coaxial / and alarm wire where needed.
3.) cut 8” path 56”-64” in wall drywall high off ground for romex wiring. i already have 250’ of romex 12/2 and blue electrical boxes to cover 110v and 220v outlets. I just “might” look into getting some short pieces of 12/3 for the 220v just to make the color coding 100% idiot proof. I know I must cut holes more than 1 1/2” to the rear in the studs, for code.
4.) install sub-panel 100amp (luckily, it will be 12” from main panel in opposite facing wall) and lighting.
5.) blow in cellulose insulation in side walls
6.) i have existing R-19 insulation roll batts in my roof rafters that i will remove and staple to the joists instead (this was one of my biggy mistakes).
7.) install fire rated drywall, per code (i DO need somewhat of a proper firebreak between garage and house after all).

so today… i started on #3. removed 8” path in the drywall. sometime this week after i talk to building inspectors, i’ll drill the holes and run romex to where i’ll put 110v and 220v. the end result will be some 10” or 12” hardwood covering the 8” path, or something else will come to mind. this was VERY nice to do as now i know exactly where my oddly spaced studs are! i thought my stud-finder was crazy, but now i see this is not just some standard 16” OC layout. some double 2×4’s, the electrical cavity, the black gas pipe cavity, etc. it made stud layout unorthodoxed.

I do watch tons of wood working videos and i do check out other garage and workshops. I’m tired of being em·bar·rassed by how sickly, under powered, cluttered, and dysfunctional my garage workshop is.