You'd need a zeppelin sized bladder to lift a moderately sized farm vehicle. I think it would likely be impractical due to wind. I think sets of 3 towers with

You'd need a zeppelin sized bladder to lift a moderately sized farm vehicle. I think it would likely be impractical due to wind. I think sets of 3 towers with cables between them so tools could be translated within their boundaries, kind of like a delta-style 3d printer, could work well.