As you can see from the image below, SJ Games cleverly squashed the hexes to allow them to align with a rectangular grid. I drew up some graph paper so I can easily draw dungeons for my Majestic Wilderlands when I used GURPS as the rules.
So I pulled out the old file and added a layer with Mega Hex border.
You can download it from here.
It is layered with the border, hexes, megahexes, and grid on separate layers. The advantage of this is that you can draw or transpose dungeon laid out on a grid to use with the hex map format of GURPS or The Fantasy Trip.