Mechanically inclined? Upcycling makes useful equipment
If you’ve got basic skills with tools, and know some basic mechanical or electrical principles, you can find useful examples & how-to’s in these sites:
Jeremy Fielding’s devices & re-purposed machine-component equipment
https://www.youtube.com/channel/UC_SLthyNX_ivd-dmsFgmJVg/videos
Mladen’s useful home-designed and built contrivances, machinery, gizmos
https://www.youtube.com/user/mladenkorotaj/videos
Ben's Inventions site for homestead equipment
https://www.youtube.com/user/benkaren1/videos
Rural people being mechanically creative
http://www.tractorbynet.com/forums/build-yourself/
I’m not “a survivalist” but this site showcases a lot of creditable, useful upcycled components
http://practicalsurvivalist.com/
Please post replies and add other sites that you've found.