These are projects I’ve worked on that don’t easily fit into other categories.
I put together a comprehensive first-aid/trauma kit to keep in my vehicle. I have bought and used pre-packaged kits before, but none had good enough quality or the right mix of supplies. I’m more comfortable relying on the hand-picked contents of this custom kit since I am more familiar with each item. I’ll have no problem getting replacements for the consumables, unlike with some proprietary kits, where lack of easy supply replacement can discourage use.
I planned and built a powerlifting/weightlifting platform in my garage to go with a standard squat rack. The design is based on other similar builds online, but most lacked sufficient detail to satisfy my perfectionism.