Did another write up on #webfinger and DIDs for twtxt/yarn that you can read and edit/comment in: User lookup for twtxt/yarn - Webfinger or Decentralized Identifiers (DIDs) - HedgeDoc
Just hacked together this small webfinger endpoint to be used as a companion with timeline: .well-known/webfinger/index.php at main · sorenpeter/timeline
Also made a webfinger lookup resolver that works with my own webfinger endpoint as well as yarnd servers:
http://darch.dk/wf-lookup.php