NSC Frigate Commonality

Do you remember the main selling point of the Constellation, as originally stated?  It was to use an existing (parent) ship design with absolutely minimal modifications so that commonality would be high, thereby keeping costs low and schedules short.  Instead, the Navy heaped on so many changes that commonality dropped from 85% to 15% at the time of cancellation.  We saw what happened to cost and schedule, as a result.
 
For the National Security Cutter (NSC) frigate, the Navy’s main goal is to get AMERICAN hulls in the water as quickly as possible without worrying about lethality or combat effectiveness.  Setting aside the absurdity of the lack of lethality and combat effectiveness, the only way hulls can hit the water quickly and cheaply is to maintain maximum commonality with the parent NSC design.  Of course, the greater the commonality, the less the firepower and lethality … but, I digress.
 
Unfortunately, we’ve already seen many changes to the parent design.  The forward superstructure is being modified, stern platforms added, weapons changed, electronic warfare added, sensors added, presumably a new combat software system, etc. and those are only the changes we know about and only the external, visible changes.  Each of the listed changes requires modifications to the internal structure, ducting, cabling, bulkheads, layout, runs, utilities, etc.  Changes have a cascading effect far beyond the main change.  Further, the NSC is not built to Navy standards so, presumably, like the Constellation, the Navy will make significant internal structural changes for increased survivability just as was done to Constellation.  My slightly educated guess is that the commonality is already down to around 50% and it’s only going to get worse as the design progresses.  The Navy will continue to make changes.  They can’t help themselves.  It’s who they are and what they do.
 
Affordable and fast production?  I think cheap has already left town and quick is buying a bus ticket out as we speak.