I am at the end of a complete glass out repaint of my 85 Targa. I stripped the car mostly and kept a list of all of the items that needed to be replaced. My body shop did the same. What I found was nearly everything that was plastic or rubber (in CA at least) was replaced due to fading, cracking or wear. This included items that are not immediately visible such as windshield wiper rubber seals, internal bumper seals for driving light wires, headlight washer motor cover, etc.
I went with mostly genuine Porsche parts, so not sure if the pre assembled kits are going to be very consistent. Some of the aftermarket items were less than perfect so be careful.
Since you are going to the time and expense of painting, don't overlook replacing your emblems and door handles (if not reanodizing them) along with all of the stickers in the engine bay, door sill and gas filler door. I replaced my rear lenses, all the bulbs, front and rear hood shocks, interior light door switches, headlight washer spots and even the door stops which were worn.
For me, since it was off the car and if it didn't look or act new, then I replaced it and very happy I did. It wasn't cheap but the paint was so nice the car deserved to be fully put together.
Final word of advice, get a parts diagram which will be hugely helpful in locating parts and pieces. While our host is excellent, they did not have everything I needed so I had to scour the internet vendors.
DCAuto has an excellent on-line diagram/catalog to help with identifying part #s.
Good luck and let us know how it turns out.