Well I did build a custom, fully watercooled computer with flow/temperature monitoring and custom fan control from scratch. Custom wired and designed and overclocked to 5GHZ. Although it's just a computer, it actually took quite a bit of extensive planning and research. Not sure that it really did anything for me, I don't tend to give myself credit for anything for some reason. I figure if I can do it, it must not be too hard.
But yea, maybe that is a good start. I need to shrug this feeling of worthlessness that I carry so heavily. Maybe these are the baby steps needed.