I had the board manufactured at dirtypcbs.com
All the components were ordered from DigiKey.
I used a toaster/reflow oven to surface mount the components.
I 3d printed a case, I had to divide the case into multiple parts as I have a very small print bed.
I did not break out the ICSP pins to headers/connector on the attached PCB files, this means I had to solder jumper wires directly onto the ATmega32U4 to upload the bootloader.
Very cool project. On your "Final configuration testing" log, what sensor value did you use for the measurements, and what does 'WFH" mean? Do you turn on the sensor when you sit down or does it automatically detect when you sit still?