Re your #10 Sandy, There was one year back in the 90s when we developed over 30 temporary back end installations on top of several significant back end and self protection engineering mods. Some got rolled up into permanent fits.
I don't think there was ever a time when the three aircraft were anywhere near the same build standard.
Taranis, We were able to adapt to changes and developments very quickly. occasionally over a weekend.
I don't know how responsive L3 are going to be in this respect.