Touring industry in 1991 I discovered that the design of Typhoon was 90% frozen, with tight weight/space limitations.
While I can fully appreciate that some tweaks to MRA4 will result from the development programme, if you are telling me the design is not largely 'frozen' then I suggest the one lacking credibility is yourself!
Engines, sensors, fitments, basic structural layout, all designed and frozen probably several years ago. Any major changes resulting from prototype development will add years, and a lot of money to the programme.....
Which of course does not mean that major changes have not/will not happen!