Actually, the mod started with the HL engine, until I played UT. My comp sucks, and UT ran really well on it, and had some sweet visual possibilities. So I set myself to learn unrealscript, and coded the HUD and wall bullet penetration, among other things. Even started to implement new weapons, when I first tried a little game called SOF. I was so amazed by ghoul, and the possibilities that SOF would give, that we scrapped all our work(which was really bad for everyone, since the mappers had to learn a new map editor, and I had to learn a new language :P). Still, I think we made the right choice, as the SOF engine is working out well for us.