Hi Mario
First off I hope you enjoy your resoration work as much as I have, It is really cool when you finally get one finished.
Like what is mentioned in the other posts this topic of under carriage finish is a on going topic. I highly recommended you read all the posts that John Z has made on this subject, the threads are posted for you. And the First generation Camaro assembly process is a must read for sure. I made a copy of it and refer to it often.
I offer up a few shots of a 17K mi. 69 Camaro 04C Norwood car that was very solid with little corrosion. Basicely the undercarriage's of alot of these Norwood cars were a mess to look at.
As you can see by the before photos, I was able to get a good view as to how this car was built. It was decided at the time of restoration by the owner and me to try and replicate the overspray detail. See after shots. I personnely like the way it turned out, and believe it is a fairly acurate interpratation of what was there before I started. And I will admit here it is probably way to neat and delibarate looking compared to what was there when I started.
I have also done several other cars with a nice satin black finish that is also very nice looking.
Anyway, no matter what you decide, ther will always be opinions and critics on what is correct. And I would never argue that this car is 100% correct. When it comes right down to it most all these high quality restorations are ovedone, and that is not a bad thing, after all we have alot more time to devote to these cars now compared to what actually happeded on the line. Not to mention the high quality primers and paint we have now.
At 59 I remember how just how average these cars were in terms of paint, fit, and overall quality.
Good Luck Mike