Just a quick post on how I rotate hulls & caps using 3 chain hoists. You need nylon straps if you do not want to scratch anything. I rig the front and back hoists either on center for hulls or through the hatch openings on caps. The example here is for flipping the cap. The center hoist is used to control the rotation, no physical lifting is done, the hoists do all the work. The nylon straps let you rotate the cap while keeping their grip as long as you cinch them up tight to begin with. I lift with all 3 to start, then lower the middle until the cap is hanging from the other 2 hoists. Then slack off the center hoist so you can move the chain to the other side of the cap then reconnect to strap. A towel is sometimes need on the chain until it clears the finish side of the cap. After it is flipped it hangs crooked so I lower the cap to the floor, re-rig the hoists using 2x4's on center with the strap eyes over the ends to give me a lifting point.