i think harbor freight sells a portable gantry. basically 8 foot long I beam, A frame on both ends, locking castors.. roll it to wherever you want.
3 chain hoists or ropes and pulleys secured to 3 point reasonably far apart in the ceiling can lift and position something wherever you want (within the triangle) reasonably well. not good for lifting much beyond a few feet off the ground, as you approach the ceiling the force on the cables exceeds the weight of the object.