Version 1 (by me :) -- This was a very (very!) rough sketch that I initially came up with. Problem with this is the lack of covers and lack of overall structure :D
Version 2 -- This proved to be too circular for its own good. Notice the inclusion of a canal system and a waterfall. How neat would this be!!
Version 3 -- V3 is less circular and more varied.
Version 4 and possibly a Version 5 are coming in the next few days. We're going to be removing the graveyard from V3 and adding in more doors and cover areas.