Rob's manufacturing of Prashant's design, adding a male USB connector.

Some components not on the fab inventory:

16MHz resonator. This is apparently necessary, in order to get 16MHz x 3 = 48MHz for the usb clock through the microcontroller pll.
22 Ohm resistors. If we need to get close to this, two stacked parallel 50 Ohm resistors work.
Female FTDI connector. Digikey 952-3199-1
USB extension cable. Then, male plug is not needed.

Modifications and additions:

Rob tested (Arduino micro <-> FTDI -> computer) at 9600 to 230,400 baud.
Matt Schrage at Harvard is working on a version with USB C connector
It would be nicer to have FTDI connector reversed? Maybe not.
How do we modify this to work as a 3.3V FTDI? Can one version do both, using switch or jumper?