Jeroen,
The details of your hood have me confused. If you look at Drummingrocks picture on page 2 "Here's the hood on my Metuchen '67, built Dec. 66" you will notice the same two holes used as yours along with the tightly stretched wire (reminds me of Tommy Boy in a little coat). But that is an "early" hood without the two large holes to run the wire through - the wire runs through clamps under the hood.
Your hood has the early feature of four small holes across the brace for clamps, but the non-early large holes for the wire.
I have not seen that combination yet. I'm not saying it is not original though. Two things I can think of that can help:
1. Figure out if the large holes are punched flat or punched and rolled over. The roll over can be felt with a finger and is about 3/6" over. The "middle" hood was punched flat and protected with plastic grommets, while the "later" hood was rolled over.
2. Provide the date stamp from the hood.
Thanksgiving was great - had left overs today and they were just as good as the first item around. Thanks for asking.