You can see this is a good quality shifter, no doubt! You can see it in the machining precision, and the good quality looking main lever bolt.
But we don't drive real Porsche, why pay Porsche price ? :P
It seems you have the big set screw backward though, I don't see any hex key for the adjustment ?
Thanks for the detailed write up, I'm sure it's going to help a lot of you soon
Ben