Have you thought about a Paper Trail style solo expansion for Tenebra?
How would you feel about someone else working on one?
I ask because I kind of want to try building a small game using the chassis to learn more about it - and maybe extract an SRD.
I don't have any plans for a Paper Trail expansion for Tenebra alone, but I'd say the rules would translate fairly evenly. It's all creative commons though so if you feel like making your own ruleset absolutely go for it!
Paper Trail was made sort of on a whim, so certainly a dedicated SRD that could undergo more playtesting and tweaks would also be sweet!