You need to keep it all together, starting a new thread for each question just makes it confusing for all. Now to answer your question again...sure there are cranes to lift boats and flip them, but very few of us have a bridge crane at our house or even have access to one. I have flipped every boat I have worked on with the help of friends. Strip her down and flip her over.....
Re: ideas on turning a 5.5m wooden hull upside down
I was able to flip it with almost one hand. Used two hoists (40 bucks each at HF) at each end. I moved the pivot at the transom to change the center of gravity as needed. For my method I had a beam in the garage to attache to. You could also attach to open trusses.
