[Porchdog]

Commercial is right in my comfort zone.

Your architect should be able to do a competent job of laying out the system, but as LWJ said, you want to talk to some contractors. My buddy and my son do a lot of jobs like yours because they are able to bid them very competitively and make enough money to be worth their while. The bigger or less experienced contractors don't do enough of that work to really understand where the efficiencies are. You also need experienced fitters who can efficiently measure and cut each piece of pipe - shop drawings are only a guideline on those jobs

A lot, or most, sprinkler contractors get their pipe fabricated by specialized shops who deliver the shole job's pipe to the jobsite, with each end of each stick numbered, so the crew just puts it in. That can work on new construction when the drawings are accurate - it's a nightmare on a retrofit.

Your pipe will be steel. Run properly, it doesn't look to bad. Be certain that the painter bags the heads when he paints - you don't want to need to replace new heads because of paint. The Fraternity got to use plastic because it was 13D - I'm pretty sure you won't get that option. The orange CPVC is dedicated to the sprinkler industry - I got to work on it's development, the agency testing and approvals and the code changes to approve it. @dad911 - You are going to want to find a contractor to move that pipe.

Commercial pumps and tanks for sprinkler are a completely different deal than residential. You are almost certainly going to need to upgrade the water service. Your fire sprinkler contractor should be able to include that in his quote.