Just a few thoughts from my experiences:
When new Porsche did not lavish hours and hours on painting these cars, a robot did a few passes.
For a factory finish cost will be lower as it is time that costs so much, prep, flatting and much more of the same until done.
If you are handy, you can do a lot yourself in removal and refitting, but quite a task.
For the 8-10K repaints you will have a stunning finish reflecting literally all that time and finish and re-assembly. you will be pleased but have to pay, new owner will be very pleased. You will never get the money back.
Chips away will charge about £300 a panel, so about 10 panels = 3K. Quality will be surprisingly good and will match the original finish which is slightly orange peel.
You can find bargain places and get a good result.
2 years ago I stripped my 1973 911, removed all the old cellulose i applied 30 years before and had it painted by a small local place in 2 pack solid colour.
When the panels were painted, I bought it all back and re-assembled it.
Cost to paint: £1500 (!)
Screen pro re-fitted = £200
Misc materials = £200
Time =£ Zero (retired mans rates...)
There is no cheap solution, you need to love the car to invest in this.