Well I don't think that I interpret it "completely wrong".
I know that every dinosaur had biting muscles and the theropodes had exactly this muscle BUT this "hole" was never as huge and deep as your modeler made it.
I've never said that there is a hole showing the brain or going through the whole skull.
Probably you can see the bones a bit but there isn't such a huge hole in there, i can see where the jaw muscles SHOULD BE PLACED in this model but they aren't even there. Your modeler covered it with skin but no muscles behind it.
Please have a look on the muscles of these dinosaurs (it's from an university, so it should be true)
http://web.missouri.edu/~hollidayca/Dino%20Jaw%20Muscles/Holliday%20Fig%208small.jpg (taken from here:
http://web.missouri.edu/~hollidayca/Dino%20Jaw%20Muscles/Holliday%20Dinosaur%20Jaw%20Muscles.htm)
Of course you could see a SMALL hole but not as huge as yours!
I've taken the muscles from the Allosaurus from these muscle studies and put them into your carnotaurus head and that is the result:
Outer muscles: (left side in the study)
http://www.abload.de/img/carnomuscle1hoqrt.jpg
Inner muscles: (right side in the study)
http://www.abload.de/img/carnomuscle20nrd2.jpg
As you can see the hole wasn't that big.
This image was publicated in the book "Dinosaurs - A Natural History" by Firecrest Books Ltd. ((c)1999) Drawn by Raul MartÃ*n and on this image and on the others in tis book the Carnotaurus hasn't a hole in there. I think you have interpreted the paleo arts wrong.
You're right it wasn't fully covered but it wasn't abaout half a meter deph like in your model!