I think what you guys are doing is a fantastic idea, but wouldn't using the new Source engine be a better choice? I mean...its far more capable than UT2K3's.

Perhaps, at least graphically for what i have seen. We'll try to stick to the UT Engine though because of the documents and information avaiable to edit it.

Well, Source will basically use a newer version of Hammer, so as long as you know how to make half life mods now, you should have little problem switching to Hammer2.