Anyboby remember the most outrages mod idea ever -
Make SOLAR SYSTEM a starliner !
Don't remember the author.
Basicaly, imagine you system connected to "starliner system" and then to the destination system. You "load" your ship into such system, it "travels" and you disembark into "real" system.
battles inside hull are forbiden - can be moded by nebula type ability. You can even plant a "bomb" there - blow up sun
(sun is called "navigator")