Thanks. After posting this, I was thinking I may have used the wrong term. I appreciate the explanation cinco!

Still not sure I'll go for this. I want something with longish chainstays, and I can't tell from the photos how long these may be. They look to be on the short side. Still haven't heard back from the seller.

I'm not worried about the frankenbike setup, as I plan to build up my own frankenbike on the frame.
Hoping to build a nice all-around sport tourer on a 531 frame.