I had responsibility (working with consultants who did this for a living) to work with the project manager, and architect/GC. All of the datacenters (back when companies put data-centers in their buildings), IDFs, MDFs. The MDF in particular was complex as it combined the floors IDF + the buildings MDF/telco connections, punchdowns, and a massive Nortel Option51c set of cabinets. We carefully laid out the room - measuring the minimal possible distance for cable techs to get in between the racks. Everything was designed down to the 1/4" in the room.
I showed up (mostly randomly) with a tape measure during construction - internal walls were up - and they were off by almost 14" - which would have made the internals almost unusable for their original purpose. They had to tear down their framing, pull everything out - thankfully before any electrics/racks/hvac had been put in place.
Having something like this would have greatly reduced that possibility. Bet they end up on every site (if they aren't already).