@r4xm,
I am very thankful to you for your info, indeed.
As it concerns the river going north, I have had controversial infos, so I obviously made bad choice. Trying to repair it in the next WIP version of the map.
As it concerns the street schematic, I just followed default City schema in Il2 map builder.
As it concerns the typical buildings, how long it would take to you to create them and import into Il2 ?
I know it wouild be very nice, but :
1. I do not know the building creation yet, even have an intention to learn it. Later.
2. I suppose the Il2 is flight simulator, not infantry one, even if I also like driving jeep through the streets of Slovakia e.g.

All and all, I started the map making only before some months. Perhaps the map in the present state is not much worse than e.g. default Smolensk map.
I consider your post the great help and thank you very much for it.