Hi,
Honesty I don't know, I'm guessing 4-5 I don't know how many certified Porsche mechanics, but I can say it sounds like Hima and crew have been doing some interesting things.
Seems like alot of customizing lately, and I assume it's due to so much "spare" cash in the city right now. For example the exhaust setup on that turbo motor is hand built = $8000 ( not my price but hey someone wanted it)