Im a fan of the oil rig idea. Id much rather have a large yacht. Not too kean on a huge ship though.(too much room to cover and keep guard) but getting a large yacht and park it at an oil rig would be nice. The oil rig i think would have ways of making fresh water. Plenty of space for a decent amount of controllable people and room for storage. Put up fencing around the perimeter and always have more than one person on guard.
99 WJ,4" Lift, 265/75/16 Treadwrights, RC wheel spacers, Sound System, CB, HID's with amberless headlights, Rola Rack...ect.ect. Money pit!