Looked at it again on my desktop with the big monitor, and I concur: GO-145. What I took to be a leading edge slat is apparently just a shadow and a highlight on the curved leading edge. The "bulge behind the rear cockpit" I took for a piece of debris behind the fuselage on my small screen is in fact the instructor pilot's headrest fairing.
BTW, does anyone know why so many small biplane trainers have swept back wings? (GO-145, Stampe, Tiger Moth, Jungman, etc) I've been told by a windy "expert" that it's to move the center of lift and center of gravity far enough aft to allow soloing from the front seat. Having sat in the back seat of a Moth, I can see why that would be desirable. Comments anybody?