Wings folding is normally incorrect gluing. I don't know about Wolf, Adrian, TCFAR etc, I glue mine together with PVA woodglue and have found it to bond much better than Epoxy. This could be why the wings went on the other planes.

Mine feels quite strong. More so than any other model I've had.

Also though, Wolf measured his plane and found the front end was slightly different to mine so maybe Seagull have re-released the design with some mods including the wing joiner etc.