It appears I miscounted
I stated in my previous post that the map for Great War is thirteen hexes by eleven and it would appear I was talking through my hat. Here's a quick screen shot from the gameplay video. It is in fact twelve by eleven. I presume there's solid gameplay reasons for this, but I had so hoped it would be a standard board size.
Interesting to note that the trench system is notional. Great War trench systems were generally more complex and zig zagged a bit more, but this makes things easier for a modular tile system.