I'd like to bring your attention to a reference that may have been missed in the past. This is an image from the Deep Space Nine Technical Manual of the skeletal structure of a runabout - a workhorse vehicle designed to use modules:
This, is the picture of the starship from Star Control II, a video game from back in the day. It is described as a workhorse vehicle which is customizable by adding and rearranging... modules. Interesting.
I figured you'd like that. In my fantasy world, everyone is interested in the same things as I am.