It’s some work, and not without some hassles such as adding new holes in your garage floor, but it’s clever. The Youtube clip says… “Turning the hull around bringing it to my new shed. In trying to find a simple method of lifting and turning, I ended up using two wooden poles and Dyneema lines as stays, and pulleys made out of low friction rings and again Dyneema.”
I’m nervous about the person under the suspended boat. I’d have some stands in place.