Ironically, I have been going through BCFiles recently (for probably the third or fourth time now) downloading and archiving as many relevant files as I can, mainly because the filefront site seems that it is becoming increasingly unstable as time goes on and I would prefer that all of these things that people have done over the years didn't get lost forever, also I do this for personal reasons as some kind of release of Excalibur nears and I prefer to be ready to throw things at it for my own amusement
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Anyways, I too have run into this problem. Apparently the link for the Promellian ships is broken, dead, or whatever. I tried searching for it on just the gamefront part of the site and it simply does not exist. So, I imagine someone must've screwed it up at one point and it never got fixed which means it's probably lost on that site for good.
Baz was one of the creators and he is on here infrequently, I'm gonna try and message him and see if he still might have them on hand.