Yes! Actually, one of the first cards we built internally is a little Arduino-compatible one with a SAMD21 microcontroller and an external-facing 0.1" pin header for GPIO.
I love it!
Wow that's actually a really cool idea
Will your specs include metric or just imperial measurements like you just used here?
Fear not, modern inches are metric inches:
since the adoption of the international yard during the 1950s and 1960s, it has been based on the metric system and defined as exactly 25.4 mm.