Second posting. I've made some changes to the design. Things to note:
- VIO is selectable between 3.3V and 5V with a slider switch
- A through-hole stackable header is used
- silkscreen is cleaner

I think that covers all the outstanding comments. Attached are the schematic, design files, and a rendering.

Comments welcome. I hope to send this for a pre-production run next week.


Inline image 1