Cool! Glad to hear that you are interested in helping.
As far as graphics engine coding, the refresh subsystem is already done. The engine is totally capable of rendering DooM3 style graphics without any additional programing.
Other points that need to be addressed are things like the network layer, logic module, sound module and input module. These, however, need to be designed first before I go about creating anything.
As far as graphics are concerned, I can help you learn to create 2D Textures/Skins for either 2D or 3D games. But, it's a matter of patience and a LOT of time. Creating high-quality skins is not an easy task but, once familiar, doesn't have to take a long time.
Skins are easy enough but there is the necessity to learn various 3D modelling techniques/concepts before approriate skins can be created (unless the model's mesh is already laid out in a skin pattern).
As far as 3D modelling, I'd be able to get you the very basics but stormy would be the one to get you really rolling on that if it's what you want to learn.
As far as sound is concerned, that would be awesome! I had planned on using some of OP2's sounds (after digitally cleaning them up) as well as going out and buying some of those royalty-free SciFi/Tech/Future sample CD's. But, if you can help with that, it'd be great!
So, nice to hear from you!
PM me on YIM/AIM at outpostmia or you can drop me a line on IRC. I'm usually signed on unless there's a problem at my apartment.