I am very slightly familiar withdifferent type of sail boat/yach hull construction. But this examples one on the pictures below are something that I do not quite understand.
First pic: This I find puzzling. First it appears there are some bulkheads. Longitudinal "stringers" are fixed to them. I presume their only purpose is to define the hull shape, sort of like a spline. On this "stringers" the vertical frames are attached. This I presume will stay as structure of the boat. And i guess on top of this frames comes the planking. Andthen another assumption from me: inner bulkheads and "stringers" are removed so only frames and plankig remain? Am I correct or wrong. Actually I would like this thing explained to me.
So, at least the first pic shows the type of construction I do not understand. What is it?