Sometimes building the racks at the shop is required but rhm9 you hit it on the nail. We had a couple of M.A. enclosures that must have weighed 600 pounds It was a nightmare trying not to touch the walls and Furniture. anyway I feel one day to deliver and build the racks and shelves, Rackmount all the equipment and prep for final and remove all garbage falls into the priceless catagory. The next work day is just making cables and harnessing. Working in high profile homes and yachts requires a plan. so when your moving metal objects around finishes that cost more than the job then thinking takes priority over brutality. We only get one shot to do a great job.
But again it all depends on the application. and all the prior post are correct. This is not a right or wrong post but a personnel work choice