hi, the first thing that i would do is find a chilis restaurant in the early part of consruction and see what it looks like. you really need to do your own estimating based on what YOU see. sure you could call some of the GC’s that do these and find out what there plumber is charging, but that doesn’t mean this is what you want to do the job for.
the only other thought that i could share with you is once you have done a couple of these your efficiency will increase drastically, but of coures never to the point that we think it will.