I would consider other shapes than a square or rectangle. With that much space you could have a court yard on one side with the workshop around it with full height folding or roller doors.
I have suggested this elaswhere but I would cut out card board with the plane area of all the machines...
I will conclude that your method does not in fact exist. I described a method in words then posted a video which was on the first page of my search. Here is the video again that was on the first page of my search, I picked because it was one of the shortest and did not want to watch lots of...
As a civil engineer I only heard of class 1 and 2 a few months ago. The work I was doing never had those sort of tolerances so I had no reason to find out unless I was inquiring.
Unless you are measuring short distances the accuracy of the class 1 tapes could be compromised by temperature. If...
You need a stainless tape measure to stop the rust.
But the other problem is the water picks up grit etc which scratches off the numbers.
I always used to wash the tape but not the holder. Dry the tape without retracting it, then leave it hanging up to completely dry overnight. Then hope it was...