The shapes are fairly simple all in model space, approx 20-40 line segments per part though this could vary, and average part size is 24"X30" I am not sure about the material and thickness setup yet, that is we do include this but I am not sure if its in the APT itself or done by another means.....and yes all the geometry is closed paths.

The APT above is from a recent part so I would say that is the format that I would need.