It is just example.
Proportions are a mess. It is very crude. I know.
Thick black lines - walls. Red circles - turrets, orange thick lines - gates, orange triangles - generators, dotted lines - dirt road.
Dark gray - buildings. Gray - road, blue - water, yellow - beach, pale yellow - ground, brown - mountains, pale brown - hills.
1. Main objective - AA cannons, like on current maps
2. Spaceport. Spawnpoint for defenders
3. Beach. Spawnpoint for attackers.
4. Park with statue.
5. Docks, some buildings, road to city.
6. Hangars, warehouses.
7. River with steep banks.
8. Bridge.
9. Mining complex.
10. Not gates, but defensible entrance. (something like in old River City, when one base was in upper city, like road to base from water.)
Buildings placing arent accurate, just to show where they could be. Ofcourse it needs more accurate planning to provide cover.
So, we have near four attack directions, not to mention jumpjets tactics.
Hills on west side grants heights, to destroy generator, as port buildings for the north gate. Dirtroad is far closer to defender respawn, and should be easy to hold, maybe needs to add some buildings near mining complex.
River and bridge have most attacking options, like north-east gates, or climbing banks. But it is far from attackers respawn, and river can be crossfired.