IP, Are you sure that the cutout was built for QE2? I want to say I've seen it there before her construction. Not that I don't believe you but do you have a reference for the claim? I'll have to look at pictures of other jobs at JB.
Cheers!
The source for that claim, I think, is my Dad who worked at John Browns and told me this so if you tell me he was wrong i'll not speak to you again!
*OR* he told me it was for QE1, and my young mind might have got confused and thought they were one and the same.
One possibility is that QE2 had a bulbous bow, and QE1 really didn't, so it would have extended far further forward at/below the waterline than her predecessors, although she was a good bit shorter... i'd like confirmation one way or another.