Planned is a a 12,000-mile loop of existing trails, roads, and off-trail travel.
Something like this.
Rue McKenrick, a triple crown veteran, walked away from his home in Bend. And is inventing the route as he goes along.
When COVID-19 hit, Rue kept hiking — but
“no longer resupplied in towns, relying on a 7 day resupply box which was sent to remote post offices. I utilized lesser known trails and continued up the east coast on the avoiding the popular, but closed Appalachian trail. …”
It’s a work in progress.
Click through for details:
americanperimetertrailproject.weebly.com
I learned of this project via the Out and Back podcast interview – episode 10 – Rue McKenrick and the American Perimeter Trail
besthike.com 
Amazing! APT what a trail this will be!