http://www.quaketastic.com/files/screen_shots/5thrj4.jpg
I'd say its about 60-70% done. I haven't added any monsters yet. I repurposed a section from my episode that I was making since I'm uncertain as to whether it will ever be released, also it fits nicer in this map than the one it was in originally.
Geometry is mostly done. In true Sandy style I have kept it simple. Lighting probably needs tweaking, I don't think even he made his maps this dark.
I haven't done any item or enemy placement yet. I don't think it will take too long. I played through Episode 4 yesterday to get a feel for his maps. I'd say one thing I haven't really achieved is the really long corridors. I can't bring myself to waste that much space on nothing. However I am hoping it will have a Sandy flavour ;)