Just read this thread from the top and found it totally fascinating! I am very impressed with your stamina and the studio is looking beautiful. I'm about to undertake a (much) smaller build from scratch at the end of our garden, only 20'x12' but big enough for my set up and a small vocal room. I can't imagine building anything the size of yours though!
As for the work coming in, just think of that line from Field of Dreams - 'if you build it, they will come'.
Excellent, excellent work!