^^ What he said...
Altamura Concepts are superb (but expensive), but I trusted them to restore/refresh the panels on my original 916 Strada.
To be fair, most of the money seems to go on labour, as they take time, consideration and a lot of attention to details.
It my be a bit of a left-field idea, but I've heard that people are looking into 'vinyl wraps' now, as it's a slightly cheaper and more robust solution.
G