@merlin - I was playing a little bit fast and loose with my terminology.
Ih the image you pasted, the inner and outer red lines are the bottom side of the keycap.
The rounded green loop is the key top surface, which deserves to be its own layer.
The 2.x by 4.x rectangle in the center is the tip of the key stem. It’s the part that slides into the keyswitch.
The other four green rectangles are the internal structural supports, sometimes called webbing or ribs.
One additional thing - I’m not 100% sure that the export came out of CAD at the exact angles it should have. (It’s very, very close, if not.) Within each hand’s keys, everything should be consistent, but there’s a slight chance that either or both hands are rotated a fraction of a degree. The key stems for the fingers should be at 5, 2, 1 or 0 degrees.
This won’t affect the factory’s lasering (since they’re using this as a guide and then manually placing everything to match the injection molds), but it’s a bit untidy.
Anyway, thanks so much for taking a look at this!