It's a 40x40 map with a 2 tile border. You start in the bottom left corner. I believe 3,38 were the start coords. The three notes lead the way to the big room. Yeap, the big room is where the ending location is. Designed it that way to 1) make it harder for the follow-the-wall folks to find the Throne Room, and 2) lead them to the Alchemy Lab. ;)