For the moment I'm trying to focus on the visual style as I'm still fairly unsure if it'll be 2D or 3D.
Visually I'm aiming for something like the pointclouds in Watch_Dogs or akind to this image
https://d2rormqr1qwzpz.cloudfront.net/photos/2015/08/27/80178-lidar.jpgI think it's important to think about the technology in the games universe and what's actually happening, so my idea is that at first we have a pointcloud which could be like an xray or long range sonar bouncing off all the major components.
Then we could have a wireframe-like blueprint view imposed over the top, a database of known ship schematics overlayed.
After this the ships own internal cameras can finally be superimposed to give a rendered, coloured in view.
I've got a rough around the edges implementation of this the video below. It uses a stencil buffer and projector in Unity to decide whether to show the camera footage or default to the ghostly blueprint.
Feedback greatly appreciated!