above, OSHpark rendering; below, KiCad GerbView.

As mentioned in the last update, this order reflects a few changes:

• changed color names to peak wavelength values (nm)
• updated name of project
• flipped shift register footprints and rerouted board as needed
• slight modification to "+" and "-" indicators
• updated USB plug footprint
  • added holes for plastic pegs
  • eliminated data pin footprint (replaced with "no data" notice in the copper)
  • changed structural connection footprint to slots
  My understanding of OSHpark's slot spec is that the above board should work properly but there are no guarantees. The two large pads are structural so I'm not too worried if they come out as shown in the rendering; I can always drill out the slots by hand without concern with respect to the slot plating integrity.