Is it possible to have multiple planets/moons is the same gravity well (GW). For example, in Distant Stars there are massive gas giants with tons of empty space in the GW, they do come with 8-12 mines, but look at Jupiter, a gas giant with several moons that could be colonized. Another idea would be to allow systems, each gravity well could have a star with several planets, and each of these systems could be connected using phase lines. I'm not sure if this is even possible, probably isn't., but if it is, how hard would it be to build?