Help required defining the geometry of Tuanella 3 - ? complex integrated conincal?

Tuanella 3 was made from a single sheet of aluminium. The remit was to have a hull like structure blunt (rounded) at one end and sharp at the other - subserving those fundamentals I hope to elucidate about the generality of most natural forms that find their way through a gas or fluid.
A thin sheet can be formed into a conical structure by bringing the ends of one side towards each other and the angle formed can be changed by overlapping those ends.
If the apex of the cone is closed and the overlap sealed then a container is generated. The standard laboratory funnel filter is made by indenting a disc of filter paper from a point on its circumference towards its centre and allowing the indent to overlap and lie flat on the cone so generated.
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If an oblong sheet is cut anywhere along its length from its margins towards its centre anywhere a cone can be made. Choosing to do this in three places one can create a container which will float if the cut edges are sealed.
Unlike boats made from single sheets of metal where the sheet is sectioned and joined edge to edge
and generated angle at those joins the use of multiple cones results only flat and curved surfaces which in terms of boats makes for an aesthetic appearance.
Selectively cutting can produce many shapes with a range of cross-sectional profiles that approach
those seen in many boats with the sole of those shape varying from a rounded v to a flattish section that might be seen to offer a degree of bilge to the form.

The general overall cross section is V and this offers a bilge that will plunge significantly before offering buoyancy. However if the hull is rotated laterally in the static situation that I propose for the catamaran then this plunge effect is diminished markedly and replaced with increased buoyancy and a tendency to plane. In the dynamic situation of a single hull driven by wind heeling will also rapidly reproduce this situation . Heeling will, of course reduce the directional stability the V section might offer but can't at least be countered somewhat if there are a pair of angled rudders. which is particularly good for the catamaran concept.

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