This is the entrance to one of the maintenance tunnels. This one is located in the rear-top hanger (assault craft hanger) and leads to the top hanger door.
This is an outside view of the maintenance tunnel.
This is an inside view of the maintenance tunnel. It's a small, cramped, grey area.
This is the end of the maintenance tunnel leading to the top hanger door space.
Here you can see that the maintenance tunnel provides easy access to the top hanger door's core. Also, if you accidentally switch to a docked entity when flying, and exit it, this is where you will end up. I had to remake and redock my rail doors to get the cores positioned right.
This is my main elevator shaft. I added a ramped area on the floor to provide easy access to the elevator core underneath. The wireless access points are on the back of the elevator and are also accessible.
This is one of my logic rooms. I have many logic rooms, and they are all accessible through a mini-maze of cramped maintenance tunnels. I felt like dark grey with an orange floor was a good maintenance area color scheme.