This sounds like a pretty interesting project - lots of interesting places. Most of the stuff I've done so far has been in an antique looking style, but I also recently just started a map in the style you posted on my home computer (literally just started mind, coastlines and the beginning colour splotches of the mountains). I don't really have any work I can show you of that style, but it is a style I'm interested in doing.

Here's some links to some of the maps I'm working on:
This one is for the monthly challenge here, and happens to include a lot of tunnels and caverns in it. It's at the point now where it only needs illustrations and filler text.

This next one is my own mega-project, and is coming along slowly. Again, illustrations and filler text are the biggest slow-downs on that one.

Finally, this is a completed challenge entry from a few months ago, and is an antique style map of downtown Manhattan.

Just post here if you're interested, and then I can e-mail you and hash out the details