It's an interesting experiment, but one that will likely produce the same conclusion that Chrysler ultimately ended up with when/if it was being considered. With the short wheelbase on E-bodies, there really isn't enough room to accommodate 4 doors. Looking at the profile of this car it becomes pretty clear (to me, at least) that the functional requirements (e.g. not hitting your head while getting in or out) seriously impact the desired aesthetics, or intended flow of the cars design. The leading edge of the C-pillar appears to be fighting the trailing edge. The only practical compromise would be to increase the wheelbase, which would essentially be a Coronet.
One of a kind, for sure. Good job on the metalwork. I certainly couldn't have done it.