The texturing in this version looks to be even worse than the original... and that would take quite some effort. : )
Its a shame since this was one of the few playable maps in Q3, so if the retexturing job was nicer it'd be almost worth having a go.
For those that do like this kind of thing though, Aardappel did a q3dm6-ish map a while back, which some of you may not remember, go here to grab it:
http://wouter.fov120.com/maps/index.html