Beater, this is a multi stepped process to complete. First, it requires 3D software to create a model to then import into either the 3D printer or CNC mill. So that usually requires involving numerous people into the equation which increases costs. I have both, 3D software(Solidworks)and a CNC. But then, it requires a CAM package to create the CNC program, which I also have. So in my case, all that can be done in house, while others may only have one part of the puzzle.
But I think any head you made in a 12 Port configuration would be a vast improvement over the stock siamese Stovebolt head, and maybe better that the Wayne or Horning heads just by virtue of incorporating modern thinking into the design.
