Looks good, I would try and make a separation on the patio between the exhaust and intake fans, maybe even duct the intake fans out and have them make a 90 away from the exhaust fans. Anything to prevent the chance that your exhaust feeds into the intake fan, seeing as they are positioned rather close.
And I'm sure your already planning this but clean up the walls and floor, make sure you have no loose debris or paint that could flake off of the walls, as with those airflows it wouldn't be hard for something to get picked up and run through your nice new miners. Good luck looking forward to the finished product.
EDIT: sorry I just saw the second hand drawing, what is the PTAC room that you are using for intake?
I totally agree with you about putting a separation on the patio area between exhaust and intake fans. I really liked the idea and will for sure implement something into the setup as such.
Most definitely there will be final touches and cleanup, but we basically pulled off old things that were attached to the walls and left it as is for now until we build the separation on the inside of the intake/exhaust areas. Then we are going to 'finish' it and of course will be putting in new LVT flooring or VCT tile depending on what we have in excess from leftover work we do in the property. I've got a room full of this and that comes in handy with leftovers of various repair jobs we encounter.
The PTAC is a 15,000 BTU air conditioner that I was planning on putting into the slot. I have lots of these units in spare (these units are normally used in motels/hotels for through the wall installations) and figured I'd just put one in that slot on the right window bottom as that is what is supposed to be for. I'm not planning on running the AC but figured for the really hot humid days we occasionally get (I'm in South Carolina) I figured it couldn't hurt. Since there is not additional investment of actually purchasing the unit, and its just sitting in the storage rooms on pallets figured I'd snag one for the 'mining room'.