: How do you envision doing the inside seam?

: I was going to stitch & glue the top and bottom first, at a 90 degree
: angle, then bend in shut. So it's not really a triangle.

: I can't layer the carbon on before stitching it together.

if it's not really a triangle, like a true rounded 'D' shape, then all bets are off for anything but a linear, tapering shape. gullwing not possible and that is what you were referring to about compound curvature i guess.

i was just referring to the fact that if a triangle, you could put 2 of the 3 panels together and get at least the lower inside seam at this stage. the other 2 joints/seams would have to be glue joints (make big internal onesided fillets first so at least approximates a seam or a wide glue joint).

i think if i was to do it, i would choose a triangular section with a horizontal chord on top or below. even if a D section i think i'd put the flat on top or bottom for aesthetic reasons if nothing else.

if triangular was chosen, and especially if the flat on top, it is of the same construction/aesthetic character as the hulls themselves, as well as now having the possibility of choosing gullwing shapes as well. if flat on bottom, the bottom chord can be designed to mate with the tops of the ama and hull.

If flat on top, there is more parallelism with the boat construction as well as having the possibility of sculpting the bottom to identically fit the hull and ama cross section. think of nick's side to side cockpit cutout, but upside down. as well this orientation cuts water in both directions(as do your hulls/amas) and adds progressive (rather than abrupt with the other) bouyancy if buried in big events.

and as the amas are to be used as an armature for c/f or glass, you have a possibility of independently major glassing the inside of top large flat member as well as the 2 joined lower. and then seaming like hell and finishing off the exterior with some transparent glass for wood appearance if desired.

some options anyway.