"I would have preferred a more "classic" shape to the back of the action"
Not sure what you are referring to as Classic Shape. Predominant shape for most non sidelock doubles is a Flat Back. This is certainly far & away above the flat look. IO also like the rounded corners of the action.
Not absolutely sure of correct nomenclature here, dhanks stated round body. A true Round Action has a more rounded shape then this, perhaps that's where the Round body, comes in. Anyway it certainly has enough rounding to make it far more comfortable to carry than a typical A&D boxlock with their square corners. As my use of a shotgun has always been predominately Hunting, I prefer the auto safety. I do prefer double triggers & splinter forends.
In my opinion you did great dhanks, most likely it would not be too difficult to have the auto safe disconnected. I once many years ago had a 20 gauge Syracuse Arms double that had the switch for the ejectors. On that one the switch was on the outside of the forend but that's really neither here not there. I liked that feature, it was about the only thing I did like about the gun.