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Hey this looks great!
However, I think some people are curious about the spacing of the buttons... where on the grid of copper pads are your buttons soldered? Can you have a close up picture of the boards and where you soldered the buttons? Also, what are the dimensions/distances for the holes for mounting the button boards?
I think if you posted them, someone could make some Inkscape (or KiCAD, Eagle CAD, etc) files so that people can etch, cut, and drill their own button boards for your project. ;)