Cranes aren't especially heavy. You would need a boom to extend 2x the maximum dimension of the cargo hatch, so probably 8 feet, out past the exterior skin, plu

Cranes aren't especially heavy. You would need a boom to extend 2x the maximum dimension of the cargo hatch, so probably 8 feet, out past the exterior skin, plus some dyneema or steel cable, plus a winch motor of some sort. Not 100 lbs but probably less than 1000.