Bit of self-indulgence (shock!) in latest blog. It's a video tour of the map, firstly just to play with video quality and secondly as it's useful to play videos back to notice stuff about the level you (well, I) don't always spot when playing it. (Especially lighting and how newer areas, while far from perfect, are much better than some original ones)
It's 8 minutes long, which considering there's no gameplay, most buildings aren't entered or explored fully, there's masses of places to add or complete and it's only a quick viewing, is indicative of the size of the map.
http://earthquakemod.wordpress.com/2013/10/23/836/