you can easily fake the collision detection by setting weapclip brushes in gtkradiant, q3map will not render them but add node brushes, it looks very realistic when you collide with the "fake node" then. If you want to know more ask me on msn berserk :)

he said he has a quake3 like engine, not THE quake3 engine...

I am making my tri-tri tests a bit more accurate, then I'll add the bezier patch... this code is far from optimal but is very accurate