Not an Eco vehicle, but it could be -
Homebuilt Recumbent Motorcycle Racer Competes in MRA Sanctioned Event
Interesting quote from the article -
"No, I'm not giving away any design or building advice. Nor am I asking for any."
He also built an electric recumbent -
http://rohorn.blogspot.com/2006/11/m...nt-design.html
His website -
http://rohorn.com/