To the left (ie Southern - had to rotate the map to fit to 200x160 window) bank of river, ie there where there is nothing yet
Have chosen to start with the city at first, as it's the hardest part, what with all the streets and houses.
In final state the map will have three variants:
1938 - only one bridge, old railroad pattern (based on German maps)
1970's/80's - what you see, three bridges, tramway network
2000's - two more bridges, highway