I saw a retro-fitted SC Nomad with an engine mounted on it in Englewood a few years back... Some guy was riding it around on the street. That poor bike looked at me like a dog forced to wear a christmas sweater by a frightening old lady. I pitied it...
My co-worker has made about 4 of those.
Looks like the same one.
He would find a cheap/free MTB, order the $200 (I think) engine from China, and slap it together.
I rode it once for a couple hundred yards. It was fun. Luckily, none of my friends saw me.
Edit - dude lives a few miles from work, and the bike gets ~100MPG.