Thanks for the pics.
Hmmm you are lucky, in the M &W the space under the bonnet is shaped like the original Beetle demisters. also (having had the car on the road a few years ago (long story), I fitted speedster demister vents so i am unable to get them flush to the skuttle as you have done.
i take it yours passed sva, if i can get mine in

as long as the tester can feel hot air come out the vent he'll tick the box, its not a huge screen is it?or a winter car.
Paul