Version 1.3 is 3.5mm unshielded, 4.5 mm with the shield (standard Pro Micro is 3.75 mm, nRFMicro 1.1 is 6.35 mm). Seems to work fine. Wiki: https://github.com/joric/nrfmicro/wiki
Handmade stencil: https://youtu.be/JWUJtmgh55M
Soundtrack: https://youtu.be/EEvopkbc4FE

00:00 nRFMicro 1.3 PCB (from PCBWay)
00:07 Handmade stencil
00:24 Applying soldering paste
01:02 Placing components
01:20 Soldering with hot air gun
01:34 Flashing with Bluepill
01:49 Removing shield
01:54 Installing
02:00 Partying