Build as big a chunk of open space as you want! This map is the Rosette panel which lines up quite nicely and which is flat and smooth. It has 5/8" hexes on one side and 1.25" on the other side and is "geomorphic," which means you can plunk it down in any order and it will line up nicely with other map panels in either scale. (Avoid using some panels with one scale and some with the other scale, as this will confuse everybody.)