Castellan Snaeper

If I'm not mistaken, I believe the Tau are unable to access the Warp, so your chapter couldn't seek that technology from them since it doesn't exist, if I'm understanding what you've written correctly. Getting their technology to travel around would make sense, but specifically stating they want their Warp technology is incorrect, since they can't access it, they don't register in the warp at all. Anyways, I like what you've done otherwise. You'll burn as a xenos-loving heretic, but I like it.