Gurps spaceships series of PDFs provide a fairly simple system for making spaceships for science fiction games in the Gurps system. This document is meant to give more options and ideas to builders.
Note that all of these are my2) house rules and not official rules, so pick and chose what you want to use in your games.
This document currently has the following parts:
This is a list of things that are not exactly space ships but more other scifi related GURPS things