Finally got the base layout done. Just a rough draft, nothing ready to show to players..
Put the images into a spoiler tag to avoid blowing up the post..
2 Levels above Hangar Level
1 Level above Hangar Level
Hangar Level (northern open end is the docking port for bigger starships, round things in the lobby are lifts to the other levels, rectangular black things in the storages are cargo lifts, round ladder things in the hangar and workshop are technical corridors leading to the lower level)
1 Level below Hangar level (smaller corridors are turret accesses)
2 Levels below Hangar Level
3 Levels below Hangar Level with Power Core, Computer Core and Environmental Controls