Actually, I just looked back at survey drawings and the site IS about 80m above sea level, so that explains the Z dimension. The X and Y dimensions are a bit more puzzling but not really a problem.
I know that Trimble make hardware as well as software. In theory, you can input all the point data from a Trimble drawings into a total station and know exactly where everything should be. That must be an absolute timesaver on site.
That is also true on Mac. Extensions load only when you first launch SketchUp, not when you open a different file (unless, of course, you quit SU in the meantime, which would force a relaunch on Windows too).
Ahh… I drew mine by eye instead of using Match Photo and adjusted dimensions a little to work in inches. Pretty close. The one I based mine on didn’t have the detail on the front of the left end piece. I might modify mine, though.