Ok, so maybe I do need a nap.

I was thinking my new Use Extracted Files / Use DAT File feature was messing up somehow, but that only renames the DAT back and forth (DID.dat / DID_.dat) and now I realize there's no default, it initially reads your current setup. mikew is correct, your game has to be extracted for any mods to work, and probably for any HUD files to be created (as is this case). Without extraction you can do nothing, except update your game.cfg, because that never needed to be extracted.
TAWC can't extract files, only Krus' extractor can do this. I can provide you with a link of the files already extracted and patched though. Just let me know, I have your email.
It never even occurred to me your game wasn't extracted already (even after you said so...d'oh!), that's why it's bedtime for me in just a bit. But I do need to add a way to inform that your game needs to be extracted other than giving you a generic message about the path (it's actually the missing ...PROGRAM\huddle\ path that's probably triggering the error, as mikew noted).
So I'll fix that as far as proper error trapping, but you'll still need an extracted game for any of this to work.

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Mark