Regarding #3, parts catalog shows it to be part of the convertible top. The only name it has for the part is "cover", so like the Pelican catalog, pretty undescriptive. #34 in this image:
BTW, you can get the part catalog here. Scroll down a bit and choose your model and year. Can be pretty helpful:
https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/originalpartscatalogue/
Congrats on the new ride. I just bought an 06 myself, so trying to learn more about the 987 as well.