How would u change the first person arms?????

Easy there bro, you only need one '?'.

You can change the first-person arms by referencing the new arms gbxmodel in your globals.globals tag (located in the folder 'globals' - shocking, really). The reference is located in the "first-person interface" section, roughly 4/5 down the tag in Guerilla.

Be warned though, that you must make sure that your new FP arms have the same bone hierarchy as the ones your are replacing - otherwise they will be incompatible with the FP animations supplied by the game. (For example, my Playable Elite project uses arms with a custom bone setup, but they required new animations for all the weapons to support that setup). However, chances are that unless your new arms are something really exotic you won't have to worry about that.
Edited by teh lag on Jul 24, 2011 at 08:52 PM

It would be cool if I had more experience in shader effects/functions, so I could replicate this:
http://www.xfire.com/video/310ff7/

My best guess: use a [0,1]-snapped function tied to the flashlight. Use that as the input to texture scrolling on the arms' shader_model, which would be half opque/normal texture and half transparent. Thus, toggling the flashlight would snap one texture to its 'transparent' position and the other to its 'visible' position, creating the effect of switching the visible arm geometry.

Okay, guess I'm off to make some new bitmaps.

What I've considered many times is making several permutations for the FP arms' gbxmodel. Not much of a point to it but it would still be interesting.

That's how I figured it'd be done.