Help needed - positioning inaccuracy in Sketchup

[Liverpudlian82]

Hello everybody,

I'm modelling a stadium, in which I want to align VIP boxes of identical size along a path, which persists of equally long edges:

I struggle to position the very last box accurately. When rotating the box, it moves slightly away from the center point of the rotation, thus it never aligns perfectly with the edge it should be aligned with.

So far I've tried to rotate the entire model by say 15°, align the box as planned and it worked. But: After rotating it back by the same 15° or saving and re-opening the model, the object slightly moves out of position again. This is really weird and frustrating behavior and really the first time, I expierence that kind of inaccuracy.

I've uploaded the model here:

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(www.file-upload.net)

Maybe you can have a look at it and verify the problem or better even solve it?

Any advice/help is very much appreciated!

Thank you and best
Markus

[Box]

Try something like component stringer or path copy.

[TIG]

It is indeed a very odd thing.
I removed the length-snapping in the Units setting to see if that helped etc, but the box will rotate/snap into place, BUT not perfectly as there is always a ~3mm 'overlap'...
I suspect it's a tolerance thing.
The project is quite large, and very small and very larger geometry will always have issues...
Deleting the large surface below the stadium changes the overlap to only ~2mm !
You also have a couple of components ['Gruppe#nnn'] in the browser that seen to have no geometry in their thumbnail - perhaps their origin is miles from the geometry - which can cause weir clicking and snapping issues...