RE: Help Identify this plane
Well, it's not a UFO. I'm currently building one. It definitely resembles the Dirty Birdy.
Yes, the TE is swept .98" - close enough to 1" - on the UFO. The fin/rudders are different, too, as well as a number of other details such as thicker wing and stab airfoils, anhedral stab and a deeper fuselage on the UFO.