Man, sorry to hear about the transport problems, that really stinks.
I had to go through this about 3 years ago, also the batwing (front apron) got torn off. I worked with Sunset Porsche to get all the parts. So, I went through the drawings in the PET to identify all the little screws and brackets and retainers, made a spreadsheet with all the part numbers and quantities. Then I emailed the sheet to Jeff at Sunset (not sure if he is still there), and he inserted prices in the sheet and mailed it back. I attached this spreadsheet here in case it might be useful.
In my case, there were some tears in the mounting holes on the bumper cover where the batwing (front apron) attaches. But the mounting screws use these little metal tabs, they don't screw into the bumper cover directly; these are those flat "nut" where the screw mounts. Anyway, once I slid all of these over the torn holes in the bumper cover, I found that they held well even with a torn out hole. But there were only a few holes torn, not all of them. But you may get away on the repair without trying to fix all the torn out holes on the bottom bumper cover.
Also, I found that the batwing (front apron) mounting points also attached to the plastic fender well liner, actually the front part of the plastic liner. If these mounting points are not present, the fender well liner is loose, and if you drive the car, the plastic will get blown into the wheel and wear away. So please check this before driving the car.
For the story, in my case it was when my son drove the car into a ditch. But that was not what tore the batwing (front apron) off -- it was the tow truck driver that tore it all up. This happened to be a "police accident", so by the time I got there the cops had called a tow truck, lights flashing, traffic rerouted, etc. I talked to the tow truck driver about how to carefully pull out the car, how will be hook it up, what is his plan? His response: "this is not a tow, this is a recovery" which basically means they won't be careful, and dragging the car out and onto the flatbed is when all the damage occurred to the batwing (front apron) and the 2 sharkfins.
Roland