I didn't plan too much, as I'm more of a just cut and go guy. I did "plan" the corners. The hills upper cosmetic edges are 15cm from the corner, and the first and second levels are 10cm and 5cm in respectively.
With the hills in place (but not attached as No More Nails does take some time to dry) it does look interesting. I'm going to replace the town sectors with something a bit more "town like" and add more woods etc.