Trooper, the racedir lists the Ur-quan as "Last seen on Usy and TdM. No link known". I have them on my HD. I also have the Chaos Legion.
Would the zips be useful to you? I've been through the rest of the list and can't help with any more of your "unknowns".
Finally, an appeal to everyone else for the sake of my own (more limited) race dir:
I'm aware that the Adamant mod, Blackstar Nexus, Chillian, pirates, moonbeams and Pandorans need to be added to
the list of neo-standard sets and mods, but otherwise, if you you have a neo-standard compliant shipset or mod that isn't listed on
this site, please let me know. I'm updating soon and would like to catch everyone. Thanks.