Intellij source - refactor VFS to use relitive path

Hey guys,

We have a hack day idea that without getting into too much detail would need to refactor some of the VFS to use relative paths for files from the project root (Yes this may be a bad idea but that's not the point of hack days :) ). Anyway Ive spent a few days trying to figure out the plausibility of this idea and have not made too much progress. Im hoping someone could give me some pointers to the scope of this idea and whether this is just not possible at all.

Anyway thanks in advance!