Quote - ...perhaps it is an idea to make up a map for a certain area and draw it and put the buildings on it.

Yes. That is neeed for a collaboration like this.
The same layout for a section has to be used by anyone making buildings, bridges, etc. or they won't fit together right. The acceptable tolerance is fairly generous, but not infinite; meaning there is some leeway on sizes (except along the front of row houses). I don't use metric system; but I have a calculator :) .

Quote - if it is not quite clear i can draw an example of course.

Please do. You could make an overhead grid map if you want too :)

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What is the general story height of those older buildings?
Modern houses have basically standard height walls; but older ones don't. Again, I think each house had somewhat different height, and that would add to the asymmetry of the project
What would be a good median story height to start with?

Friends don't let friends use booleans.