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Also check out !diy@beehaw.org
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I'm not sure a friction roller is that great of an approach nowadays
Also, I don't love that ~~there's not a single picture of the system installed on a real bike,~~ nor any audio of it running next to a middrive e bike, or even a hub drive retrofit kit
Edit. Oh I missed the install video. That is surprisingly small!
They also have a lot of example pictures from real bikes under the "Assembly" menu option.
Oh cool you can fit it to a Brompton
A bit on the pricey side, but then I guess the official Brompton ebike is like 4 grand