Preach made a Quake modelling tutorial during Quake Expo. I'm sticking this in the forum because it is very good. I knew about it at the time, but I was so overwhelmed about all the QExpo stuff at the time, I lost track of this.

It's outstanding and I want to ensure that it is in here, in the event someone modifying models or actually making models needs it.

http://qexpo.quakedev.com/booth.php?id=32

QME 3.0, which is in the downloads section, is really great for reskinning models but is somewhat intimidating to do much else, in fact the tutorial by Preach actually doesn't use it for the bulk of the work.