Comment by JKCalhoun

My only critique is that I expect there is a lot of "cut off" when they fabricate these flat pieces from rectangular stock. (I assume the shape of the pieces are not optimized for nesting within one another when laid out on the original flat stock — picturing all kinds of odd, curved scraps.) Presumably the cutoff material is recyclable though.

EDIT: many of the examples look "sectional" where, I suppose, if you reduce the shapes down to enough sections you can make better use of sheet stock — the tradeoff of course being you need to add more joints requiring fastening and perhaps loss of strength.