Minecraft wiki entry for Multiplayer_PvP_bases, associated text: Build a flying machine and drive it to where you want your base. Place blocks on the machine so the pistons can't move. Use those blocks for your base. When you finish your base, fly back and bring in your animals/villagers. Make sure the flying machine is at the right y-level, or else the machine will go over the base, or suffocate the animals/villagers.