I've been working on this for a bit over two months now, and I have gotten pretty far along as far as pass 1 goes.
Progress map Feb 06
Green - pass 1 complete. Yellow - needs some work (or just make Squally do it). Red - incomplete.
I've been landscaping off of RomanDubina's concepts, stuff left over by previous landscapers as well as my own ideas. Most areas had to be done almost from scratch though, due to overuse of repetitive or unwanted assets.
I could go more in depth, but I'd rather just do more landscaping at this point. Here's a big ass album. Sorry about the red lines, those help me organize claims in the region.
Album link
I used my own enb, which is just god rays + fixed shadows. Its pretty nice.
http://imgur.com/a/NlMg0

Wow, VERY nice work!
Wow, VERY nice work!