https://interestingengineering.com/inventor-who-built-wheelchair-out-of-electric-bikes-for-girlfriend-starts-mass-production I thought this was an interesting build out of 2 RAD fat bikes.
Pieces of what we call "wholesome engineering" always manages to warm our hearts. About a year ago YouTuber JerryRigEverything, aka Zack Nelson, used his DIY skills to weld two e-bikes together with a seat in the center and created an “off-road wheelchair” for his then-girlfriend who is paralyzed and got around in a slow wheelchair.
Now, they are happily married and they've announced that they are selling the base model with no suspension and one battery for $3,750, offering the same relief Cambry got from the bike to everyone. They've named the vehicle "Not a Wheelchair", and the duo built upon the original design making it an even more reliable off-roader.