Shoestring
I have to agree with Genghis, the trail of broken landing gear legs, exhaust pipes and the loose and missing rivets in aircraft with less than 500 hours flight time tells the story better than Genghis or I could.
It is my guess that the UK CAA will make the latest SB from Sportcruiser an AD, if that happens the wings will have to come off most of the fleet to replace the loose rivets in the main landing gear support structure.
As for the Piper involvement it is my guess that the whole idea was driven by the marketing people to counter Cessna's Skycatcher, as soon as the engineers got a good look at the aircraft and got into sorting the over sensitivity in pitch it became apparent that the aircraft was not robust enough........... So wisely they backed out sighting "marketing differences" as the reason.
My guess is that Cessna also realised that an aircraft built down to this weight would never take the rough & tumble of flight training and dropped the Skycatcher for the very same reason.