Took forever to generate this thing without my computer crashing.
I take no credits for this.
33 x 30 chunks x 8 levels
edge: -272, 99, -256
McTerra - 99 blocks tall 50 x 50 chunks Stone Flatland
McDungeon - Dungeon (you don't say?)
P.S. Spawn set at the center, use this map to find the entrance, it's the tower at the east side...