That plane is a legal eagle ultralight. It uses a half vw engine. Here is the webpage for it:
http://www.betterhalfvw.com/. The designer has made a two seat non-ultralight version called a double eagle.
He recently came out with another ultralight version tailored for big guys. IIRC, it is 245 lbs empty but has a 570lb gross. There have actually been a few good articles recently in EAA Sport Pilot magazine about what he went through designing it. This months article is about CG. I have never heard anything bad about the designer or his airplanes.