Sound deadening (Mastic Material) applied on the back side of the Quarters.

Chrysler made COMPLETE Concepts that never made it into production.  They “wasted” money just like the other automobile Manufacturers.

It can no longer be said a 4 Door prototype wasn’t feasible due to the fact that Chrysler didn’t have sufficient funds.  They obviously did!  It can no longer be said  that they wouldn’t design something that wasn’t logical with respect to certain design features.  They obviously designed them and then completely destroyed them!

This 1967 Concept Barracuda (shown below) dismisses any of those objections even if you choose not to believe that a 4 door Barracuda was actually built.  The possibility does however exist that there was a 4 Door Barracuda as described in Roger Johnson’s commentary.  If Chrysler could afford to engineer, build and destroy a newly designed vehicle then they could afford to have commissioned their Coach-work affiliates to add two doors to a 1970 Barracuda that was engineered around their “new” 1971 B Body design.

Can’t help but think……a 4 dr E-body is an answer to a question that was never seriously asked.

I agree!  Why would GM have ever wanted to make a 4 Door version of their Corvette?  What was the purpose for “wasting time & money” on that concept car?  Or the 4 Door Javelin?  Or the 4 Door 1965 Mustang?  Or the 4 Door 1967 Firebird?  Wait till you see the Barracuda that Plymouth engineered (and built) before deciding on their 1970 production version!

Best of all, none of our precious classics have been sacrificed (yes, I understand there was a 4 door b-body that was pulled from a junkyard and given a new life).

You are 100% correct!  Here is a picture of the car after Steve cut it apart, had welded in some rocker panel sections and the metal surround for an E Body windshield.  Also  pictured is the Body without the Doors in place.