here's a video on restoring headlights from Chemical Guys.
https://www.youtube.com/watch?v=BGQEHhxXYoc
Some Menzerna and a cutting pad on your orbital buffer should make that black paint look new in a few hours.
Griot's Garage leather cleaner or 1Z (from autogeek.net) works well on Porsche leather.
working brakes are good too...
don't get attached to this thing.... it probably has a scary past. Just keep her shiny and adequately running, maybe you can get some profit on the flip towards a Boxster with a more transparent history. Porsche mechanical parts are expensive and that's assuming you're doing all your own repairs.