@raxo2222 The plan at the moment it to make the extra galactic part 110 tiles high (so 13.75 tiles on average per zone). Which zones do you feel should be larger and which ones should be smaller? In the end the total map will be 110x220 or 24200 tiles.
Local Group, Virgo Cluster, Observable Universe and Unobservable Universe doesn't have to be very thick, as they are very homogeneous.
110 tiles is enough for 15 cities utilizing 3rd radius, when placed in single line.
List of zone thickness:
Earth: 57 tiles
Orbit: 3 tiles
Cislunar: 15 tiles
Inner Solar System: 17 tiles.
Outer Solar System: 22 tiles.
Stacked height: 114 tiles (zones beyond Outer Solar System aren't stacked on top of each other).
In these zones you want to build cities on KBOs and stars. In Transtellar you have to make choice between Interstellar and Plasma map categories when settling.
In those two zones you should place KBOs/Stars terrains, in such way that cities would never steal plots from each other.
Transneptunian has Jovian map zones on KBO terrain, but no need for them to be bigger than 2 tiles per KBO - 17 tiles.
Transtellar has fairly big stars up to 3x3 in size (Plamsa category for Star terrain) - 20 tiles.
These zones utilize only single map category in them.
Orion Arm is more uniform than Transneptunian space - 13 tiles.
Milky Way mirrors Cislunar space with Galactic Core - 15 tiles.
Local Group is very uniform (single square features) - 10 tiles.
Virgo Cluster is very uniform and has (dwarf) galaxy features lumped in groups. - 10 tiles.
Due to extreme uniformity you can place single line of cities, 15 each of them utilizing 3 radius square.
Observable Universe is extremely uniform - 7 tiles.
Unobservable Universe is extremely uniform - 7 tiles.
Hyperspace - Cities can be placed inside zone - 7 tiles as to not steal tiles from Unobservable Universe.
This means 106 tiles thickness in total.
220 tiles in height would be used.
Cities with 5x5 working zone (standard) have cut corners.
Cities with 7X7 zones have chiseled off corners.
In red square its working radius of 2.
Non water tiles is working radius of 3.
Water tiles is what city can't touch.