http://www.head-fi.org/t/611982
That is the original post that inspired this design, describes the goals of the project and introduced me to headphone modding,
However going through the effort of making or buying wood cups, headband, gimbals and earpads adds so much to the build that you may as well use more expensive Sennheiser drivers instead.
So I decided to design a set of cups that would be simpler and cheaper to make. The earpads and headband pad in the pictures are nice additions but not required as it is light enough to not put much pressure on the top of your head and the clip holds the KCS75 out of the cups enough that the padding that comes with them can be used.
Close the holes in the cup with tape from the inside and fill the cups with loose cotton wool to adjust the sound.