Cardboard Packages issue

Hey, i am trying to discover a way to develop cardboard packages in grashopper.
I know Ivy is a great plug in that already solve a large amount of my issues, but there is a vital question.
Cardboards have various thickness (2mm, 4mm, 7mm etc)
and when they are bended you get a “half thickness” outside the plate that causes some imperfection during the assemblage. So, what need is a way to make the compensations of the plates sizes, proportinal to this “half Tickness”, does someone know a way to solve it?