Wow, lots of progress! Even on your camera's audio I DO hear a difference. It's sounds a lot more controlled and slightly tighter/warmer. Sounds more usable already even without any treatment in there.
The colour scheme looks great. It's calming, bright (especially once you put those panel colors in you mentioned), creative and not all cliché dark-schemed like a lot of studios go with.
+1 about avoiding a break in the signal chain if you don't have to. Not that I'm an electrician or pro audio designer/specialist, but in my setup, I have a 24 channel snake (XLR and 1/4" TRS) coming from my tracking rooms downstairs, patched into my interface and pre-amps in my control room upstairs for when tracking instruments down there. However, when I have anyone recording in the control room for things like vocals, bass DI, etc, I always plug them straight into the pre-amp rather than going the lazy way into the snake first. I take the extra 30 seconds and unplug what's patched into wherever I'm plugging in to record, so the signal chain is devoid of extra circuit breaks. Why the hell not?! I think anyone that would argue that is wasting their breath imo. If it works for YOU, it works.
Can't wait for the gear/acoustics to go in there. I'm sure your acoustician guy will tell you the best place to have the drums setup and best places in room for amps, etc, so I can't wait to see how you'll maneuver everything into there. I strongly suggest quitting P90X (it's time consuming!) and getting that gear/acoustics in there with a vid pronto!
Looking great.