I'm using flat-topped hexes, no reason other than I like the look a little better.
Arrangement: I was thinking of an area shaped by a massive explosion, so brainstorming kept leading me to radially symmetric designs.
1) Everything connected with a hole in the middle (so a ring of 6, a ring of 12, and a ring of 18).
2) Two disconnected hex maps, each having a ring of 6 and a ring of 12 with a hole in the center, and connected via teleport.
I like the idea of the disconnected maps and will probably play with it later, but the single connected map was working better for me