That's probably about it. Shadowrun (sadly) isn't Hardwired, where t-birds and smuggling runs are the default focal point of the whole game, so material on them is somewhat sparse. They're so much out of the price range and above the power/combat scale of your average "sneak into the secure facility and steal a file" kind of default Shadowrun that publishing much more about them would just tick some fans off, I think...so what we get ain't much, and it looks like you've found most of it (especially for SR4).