Thought I'd give a try at how a solid wood version would come out.  Here
is the result of about 45 minutes prototyping with a piece of 3/8" Cherry
I had lying around.

A couple notes:  The 5/64" (.078", 1.98mm) bit has some tendency to
wander, as can be seen in the holes.  I also goofed the measurement so
these are 11/16" instead of 9/16" wide.  I didn't notice that until I was
nearly done, and figured that since they weren't actually going to be
used it didn't matter.

I also didn't add the slot for the PCB, mostly because I wasn't sure of
the size, and I didn't have the appropriate cutter lying close by.  I
have a couple thoughts on that.