If you have never quoted a big job like that, fair warning, IT CAN EAT YOUR LUNCH.
Bidding it can go many ways. Punched mats are cheap, and you are deffinately past the 250 piece mark....
Precut, and washed glass goes without saying.
Premade frames at that level can be a time AND profit saver.... It's amazing how long it takes to chop and join 100 frames much less 600.
600 by the way, is a major portion of many small shops annual output.... 3 weeks?? We're talkin Extreme Makeover Home Edition.....
at 600, I would also be ordering precut backing.... maybe eve pre-DONE framing....