Are the seat stays bolted to the seat tube? I mean, with the banana seat like that, I imagine that a lot of the rider's load is carried by those rear ... seat ... struts(?), but I don't think I've ever seen seat stays that appear to bolt to the frame like that. It looks like one long carriage bolt that runs through the seat tube (and seat post?) and seat stay joint.
This is the bike to have to ensure your bike ride is a solo one. :-)
"Kids, I'm going on a bike ride!"
"Can we come, too?"
"Sure, but I'm riding my bonazarad bike."
"Oh...no thanks."
I'd have to have that bike, for the "wow" factor alone!