for asthetics, what about trying to bring in a certain level of 3-D. With certain groups of hexs raised or lowered vs their neighbors. maybe all of your impassable lines could be changed to different tiers. you can attack a tier 1 above or below you, but not a 2 tier difference. The impassable boundries could represent regions that are seperated by more than 1 tier of height.
Personally, I am colorblind, so I would liketo see more bright and vibrant colors that arent to similar in shade (like the europe 1914 map). Right now, the coloring looks alot like the colors chosen for gilgamesh, and it just seems a little drab. But that is just me.
I love mega maps, and good luck with this one. This reminds me of a question i have about conquerman. Since it is so big, my computer has a hard time loading it. I actually have to turn BOB off because there is soo much information on that map. do you see anything like this resulting from your map?? Is there a way to make a map with 300+ terts, and keep the information level down so that it doesnt bring my CC experience to a crawl