Ok, scrapped most other stuff, but will probably end up recycling it. This time, I know what I'm doing. More than last time.
Instead of finding all the electronics in a cupboard at the end, which is unrealistic, the player has to get separate parts from wiring boxes - eight of them. Catches are, they have to get the ones furthest from the exit to the hub to avoid electrocuting themselves, and some removing some electronics will help and hinder them, e.g. removing a particular part disables some security doors that slammed against you when you tried to come the other way, but also disables the elevator you need to use.
ScreenshotShows the airlock entrance to the maps, exit to the hub is behind. Of course, vents will be provided so that the player can still get out after he's shut down the airlock's power. (Hence the green light on the doors.)