6 months?!? You're being a little minimalistic :-)
No, not delusional, just just spuriously optimistic LOL
Really, I hope it goes smoothly and expeditiously for you, I wouldn't wish my experience on even my worst enemy:JT notwithstanding :-) My contractor had also done huge multimillion dollar jobs. But, as yours indubitably will, thought that acoustical measurements and sticking to them was, well, ridiculous. How can a foot or so here or there effect the sound?!? My advice: stay on them, and see what they are going to do BEFORE they do it, so as not to have to UNDO it and do it again. Know the prints well, weedhopper. It's a painful but ultimately worthwhile process. Oh, and expensive. I'll be out when it's done. I may be much older then :^)