What would justify that I increase this interval?

Sorry, I do not have any idea. 1 km to 1 km appears to be enough for me, actually it seems to be much too much. Why is it, that the rooms are not located at or near by a value of 0 cm / km, but are at e.g. at - 27.000 cm or somehting like that? I didn't intend to have positions like that on my drawings.

Very sorry for that, Emmanuel, I didn't want to complain, it just should be a statement in that context. Of course you will have some very good reasons for using this forum.

I received a notification e-mail for your posting. Very strange.

Yes, I had checked, no e-mail in the spam folder.