Actually, I've tested all Q3 models in OpenArena, and the only one not working (with or without shaders) are Orbb's teamskins, because the eyes are always brown and I can't find the problem. I feel it's a shader misalignment... oh well.

The standard is fine, BTW.
The others work even without their shaders without significant changes.
I'm not sure, but if you rename some model (i.e: from sarge to mynx), it might work.
It will work, but to really make it standalone, the skinfiles should be corrected as well. Those are just simple texts, it's an easy task.