Boat design is like a puzzle.
It always starts with a drawing, and as mentioned above a good description of what is expected. If given a free hand as far as the overall boat, it is important to nail down the type of accommodation plan as soon as possible. Yes, many boats are designed from the inside-out as shown with the shoe boxes production so prevalent these days, and this one is no exception except for the fact that by design the look can be rendered much better. The sketch arrived and surprisingly only few changes where made from the original. A separate shower, more space in the forward cabin and a modification to the table in the cockpit. Also a little later, the inboard rudder was switched to a transom mounted blade with a skeg, the easier way to install a trim tab for the wind vane part of the installation..Fail to plan, plan to fail as they say. So, a project starts on paper or rather nowadays with computer aided design programs. For L'O. the size was limited to 40' to avoid regulations over the 12M. limit. The envelop with the beam and the draft define her main characteristics. Draft is always a big decision making. In this case, a steel boat and no specific concern about shallow water, I felt comfortable with a depth of 6'-3" -1.9M. to achieve the stability and performance required.
You would expect to see a fin with a bulb at the bottom. Well, you see with a steel boat it is imperative to keep the ballast low but also to be able to keep within the foil fuel and water, sometimes batteries and pumps. Therefore I avoid bulbs which would implicate a thin upper shell. They are also a b.i.t.ch to build and there is nothing better that a well drawn foil from top to bottom. I favor a trapezoidal profile because the design brings the lead further forward and benefit of a longish top for added volume capacity. A far as the lines plan. Again, one has to adapt shape to the material medium employed. With metal boat, I favor three options. Developed chines; developed round bilge or the origami method which I call Imagiro.