Matt,
I enjoyed EFaD very much and look forward to starting DE. Don't forget there's another water choke point in the south, at Elephant Butte, near Truth or Consequences.
Southern NM is a whole different world from the north, with a huge patch of Fed. land in White Sands Missle Range and Holloman AFB in Alamogordo (home of the Stealth Fighter). I lived in Las Cruces for 10 years. Pat Garrett was murdered not far from where I lived. Off to the west is Columbus, where Pancho Villa led a raid. A little further north of Elephant Butte is one of two Civil War battlefields in NM. I still miss the very strikingly beautiful Organ Mountains, just east of Las Cruces, but not the spring winds and sandstorms.
A few years ago, I heard from a faculty member who did field work in that area that the "boot heel" of NM was a hellhole, with immigrants and smugglers in huge numbers. One research group watched in horror as some people went through their vehicle in the middle of the night, then had to lay low as the looters went searching for the owners of the vehicle. I've seen suspicious vehicles out in the middle of nowhere near the border, when I was heading out with a friend to do some hiking. We just drove by and minded our own business (but kept our guns close) and hoped they'd mind their business.
It's a wonderful, fascinating state, with tough, resourceful people. You couldn't have picked a better setting, IMHO. Your readers and fans here will do our best to help out!
Looking forward to it,
Dirty Bob