The Goal: Create a small two room (live/mix) studio for personal work use. We'd like the ability to fit a small band if needed, but it'll primarily be used for drum/instrument recording, production, and mixing. I'd like the control room to be suitable for 5.1 mixing ideally, but primarily focused on music mixing as that's my main gig. My rough guess is isolation will ideally be around 55-60dB - although property lines are fairly far away, it gets quiet out here (20-30dB ambient). I'm currently in the design phase would love some input from folks more experienced than I.
The Space: Here it is in all its glory:

What's mapped here is the usable space, and the plan is to split it into part workshop part recording studio. We'd like to keep the garage door and opener in tact for easy workshop access from our driveway. Everything is on concrete slab and ceilings are currently about 9ft high. Electric and lights are already run on 3-4 separate breakers, but we'll likely hire an electrician install a sub-panel when we get to it.
The Plan: I have two layouts but would love to hear your thoughts. We plan on doing the mix room with John Sayers' inside out walls, but a normal ceiling.
Here's layout v2.3:

with "gear":

Pros:
- Open live room
- More efficient use of space (I think?)
- Some storage
Cons:
- Lots of angles
- Still not a lot of storage
and v3.2:

with "gear":

Pros:
- Straightforward construction
- Slightly more sqft in mix room
Cons:
- Narrow live room
- Not much storage
Other Notes:
- Storage. Airlock can be used as well as building shelving inside the live room, but is there another solution I'm just not seeing here? Luckily the house itself has a lot of storage so we can spill into there if needed.
- I'd like to retain as much ceiling height as possible - the existing ceiling joists run horizontally relative to my crude drawings. My plan is to stagger the new ceiling joists with the ones currently there a la Rod Gervais, so the orientation of the rooms is important. Hence the normal ceiling in the mix room.
So that’s pretty much it. In v3.2 I’m mainly concerned about the space and if the live room will be too narrow. v2.3 will have its own challenges I’m sure. This is my first full studio build for myself so I’d love any input I can get! Many thanks and stay safe.