An atreus keyboard with trackpoint.
Resources that helped me building it:
Modded SVG file with more space between the keyboard parts and cutouts for the trackpoint
https://github.com/foosinn/atreus_plus
My sourcecode (see qmk_firmware/keyboards/atreus)
https://github.com/foosinn/qmk_firmware/tree/foosinn_plus
Realy awesome trackpoint <> QMK docs
https://github.com/alonswartz/trackpoint
QMK PS2 docs
https://docs.qmk.fm/#/feature_ps2_mouse
Trackpoint pin docs
https://deskthority.net/wiki/File:Pinout-trackpoint-LVC9.jpg
Pin map of the Micro Pro
https://github.com/qmk/qmk_firmware/blob/master/drivers/avr/pro_micro.h
Great default Atreus build guide
https://bergie.iki.fi/blog/atreus-build-log/