Omega

200m saucer positioned over woodland mansion. Include 4 biodomes with food, water, forests, and recreation as well as internal support city and fully armed weapons array, redstone enabled bridge comand & control-core (both lava beams and TNT cart bombs - tests at current altitude appear promising - if not downright devestating).

Below the saucer is permanent shadow from the colossal build so it's a hunters dream down there.