At the moment I can't see how you are doing this then, the two plots you have presented so far seem to show a near vertical bow combined with non vertical side walls. I know you haven't finished yet but I don't yet see how you can have those two features without a small amount of torturing.

A small amount of torturing is not a bad thing it just makes getting the flat patterns more difficult.

I am keen to see how your design progresses, good luck.

Gareth