Rear quarter panel destroyed

Yesterday we installed back disc brakes on my son-in-laws car took it for a test drive and the brakes got real hot. When we got back to the shop we jacked it up pulled the rear tires and figured out what was causing them to heat up.
We put the tires back on and started working on other things.
Larry worked on getting the heater control wires hooked up and the only thing left to do to his dart was get the defroster tubes installed.

He decided to take the dart to the store to make sure the brakes didn't get hot.
About a mile from my shop the left rear wheel came off at about 35 mph and pretty much destroyed the rear quarter panel. He wasn't hurt just shook up.

Some how we forgot to tighten the lug nuts on that side. A stupid mistake for sure:angry7: and one that should never happen.

Now a car that was close to 100 % done is back in the shop and we have to figure out how to fix it. :dontknow:

Hate even admit to forgetting something as rudimentary as tightening up the lug nuts, but it happened and here is the aftermath.

Body damage 001.jpg

Body damage 003.jpg

Body damage 004.jpg

Body damage 006.jpg