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Aside from kicking myself over this repeatedly, can anyone advise me on roughly how much this will cost to repair?
Things like this happen. Unfortunately, without pictures it's really hard to say, but don't be surprised if the estimate is sizable especially if you've hit more than one panel on your car. Scraping against concrete isn't usually the kind of thing that PDR is good at repairing. PDR is good at removing dents without creases or cracks in paint. If you don't know of a reputable local body shop, I'd call a local Porsche dealer and ask them for a recommendation. You can also ask for suggestions here. I wouldn't waste time worrying about what it might cost. Run over to the shop so you can get an estimate and find out! Good luck!
Korva World Collision has a good reputation in the Vancouver, BC area. They have worked on several Porsches that I am aware of and do great work. I have no affiliation with the company. I was referred to them by another couple of Porsche owners who had their cars repaired there. All of us were happy with their work.