Since a bunch of people want a Craftworld, then let's use a Craftworld. But do we need to be Eldar? We find a deserted Craftworld with the lingering spirits of the Eldar there who won't/can't exactly tell us what happened. We either fight them or gain their trust, setting up a mini astropathic choir type thing(not necessarily of humans) to communicate with them. Then when we try to get this thing to go where we want, the Eldar spirits seem to guide it near seemingly random places where we find more ways to repair/improve the Craftworld, as well as build our ability to fight off threats. Meanwhile we gain clues here and there of what exactly happened to the Eldar, and hopefully avoid the same fate.
This sounds a lot more like an RPG scenario, but there ya go. I'll admit that I'm not entirely sure of how exactly a Craftworld works, so if this idea wouldn't work at all, then lemme know and I'll try something else.
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Last edited by SoulGazer; 05-02-12 at 08:56 PM.