Step 2You'll need...
iImage Information

Some 1/4" plywood. I had an offcut that was 8' long and about 1' wide; this was plenty for everything except the base. I had another piece of 3/8" plywood, part of a packing crate, that I used for the base. To cut out the hexagons - at least if you use my method - you'll need a miter saw. To rip the plywood, you'll need a table saw (or bench saw or circular saw with a guide). And to cut out the little pieces of plywood that make the board 3D, I used a scrollsaw. If you could tolerate a little less detail, a jigsaw might do the trick too. I'll suggest some simpler alternatives for each terrain type.