It could be a nice addition to the guild system.
First, Guilds should make a choice, joining light or dark side theme, and building a "base" like an imperial destroyer or light version, where you can buy upgrades with gold or currency (probably not gold while we are at credit crunch).
Those upgrades may increase some stats in a % in some areas of the game (like GW, raids or events)
Im referring to a coop upgrades, not individual. Those should be exponentially expensive. The ship may have different upgrades on different parts of the ship. Even depending on dark or light side.
There are multiple ways to develop this