Ordering 100 boards from PCBWay, as someone bought out my entire stock of Octosonars. 

Tweaked the design as follows:

• upped all the 6 mil tracks to 8 mil - the OSHpark boards failed on the first pass. I'm not sure if this is related, but there was room to bump them all to 8 mil which is what I have done in the past for signal traces.
• Swapped out the external second ground pin to be an INT pin to match the old board pinout, rather than have the non-feather users hunt out the feather gpio pin
• Changed the references to 5V to VS. There are apparently 3.3V compatible HC-SRO4 variants now available, so VS = Voltage Sensor, so the whole thing should be able to run off 3.3 V. Documenting this clearly Will Be Fun.
• Tweaked some of the illegibly small silkscreen text from 24 mil to 32