Peter: Your comment makes me realize that the highlight is too strong for a non-NMF Mustang but, yes, there is a bulge there. The base of the rudder was fatter than the upper part.
That highlight is usually evident running back along the fuselage, to approximately the last inspection plate. Most choose not to (or don't nontice it) add it to their profiles.
Help! I'm working on RAF Mustangs and I'm having trouble with the louvered vents used on many RAF Mustang IV. Does anyone have good photos of these? That would come in really handy. I've searched quite a bit and only found one acceptable photo. I guess I'm using the wrong keywords...