Click image to view full.The first thing you'll notice that's different from the Halloween map is that there's a lot more land, so in the thumbnail the details are going to be smaller.
I sailed in a boat along the coastline until I found a snow biome. Now I have a pretty good showing of all the major biomes. Snow/Ice in the left, forest in the center, desert and plains on the right.
Looking at my mega-project, I've filled in the water within the circle, leveled more land, and put 32 layers on the walls. It's starting to take a dome shape now. I don't plan on doing a complete dome; I want an opening at the top. Similar to the dome of the Pantheon in Rome. Although my opening will be bigger in relation to the dome.
How it looks in-game. I forgot to disable the fog when I took this screenshot.
Click image to view full.I figure I need at least 22 more layers.