I had a pair of the spoilers form Larry. The wing was right. The posts were way wrong, both in shape and spacing.
Not a bad job so far there. Unfortunately, when I make something, usually by the 3rd attempt I have something I am satisfied with. Center post is smaller on the original and the rear slope on them isn't right. The ends you did look a bit too long and droopy. I applaud your effort since I've seen other attempts at clones take the easy way out and substitute something easy, like this:
I would reference this pic to fine tune yours.
The Green Camaro is probably my favorite Muscle Car of all time. I've never seen a clone of it I liked. I can't really explain it, but I just always feel let down by them- which is not the case on clones of other cars. Just be careful on what you do. If you plan on owning your cloned car for a long time, I would encourage you just to build the car with the vintage style you like vs copying the Green car. I think your satisfaction with the end result will more enduring.