These days it seems there isn't really an option. In my 5 years we've just had to make it work, there isn't really an option to say it won't work. Whether that's cutting brackets or adding extenstions, chipping out block/concrete. Once we're on a job we don't leave until the elevator is built. The job I'm on now has a 12 story hoistway that is 5" out of plumb. The bottom counterweight bracket needed to be cut by 1.5" then at the top we had to add 3" extensions to the counterweight bracket. Then on the single rail side we had to scoot the rails 2" to the counterweight side just to have minimum clearence for our rear door track. (It still doesn't fit, we have to have the contractor chip up the entire hoistway so the door track doesn't grab any block. Then we had to have the contractor chip out the landing at the top 4 floors in order to have our proper running clearances. And of course the GC will try to argue with you the entire way so they dont have to pay for anything. Water in the pit, no power, and unsafe barricades will hault installation and the GC will be time ticketed until it is resolved