Has anyone purchased the fiberglass deep valance that is a replica of the 914-6 with the hole? If so, how is the quality, does it feel strong once installed, and was the hole difficult to cut-out. I believe it is sold without the hole cut-out.

Never, but...

The QRS parts I bought were thin and flimsy. The finish was good though. I had to build up the top edge of my bumper top so I could trim it to fit. The front valence I bought was built a little thicker than the bumper and only needed mods where my oversize cooler and tow links were placed. Mods only because my application is custom.

The AIR parts I bought were much thicker than QRS (still less than 1/4"). Finish was good and these fenders went right on the car without modifications. The AIR rear deck lid I has was very well built, made for hinges and latch. No issues.