Two splines are used to control a series of surfaces and the toolpaths used to mill the surface.
Here are the lines overlaid on the surfaces. At various points the surface splits to allow a small aperature to move from behind. The various iterations of the line drawings are made through the movement of the two splines. Digital Project was used to define the relationships and only after everything was worked out, the splines were modified to approximate the final proportions of the splines and aperatures.
This series of models is more of a proof of concept for the aperatures. A new model will be developed using the splines, but using a different method to create a model with thickness. The current iteration is only one surface.