My brother's friend started building an aluminum
sailboat, 55' in length. He had plans but I don' remember the name. His jack stands were mounted in concrete while under construction. He did a masterful job although he had never sailed. He machined solid SS rod stock to support his lifelines
Worked on it after work most nights, every weekend, every vacation
. He was forced to launch it prior to completing it because the yard where he started the project some 25 years earlier was sold.