With the recent Skysentry thread, we've seen a couple of variants of the DC-6 & DC-7 (I believe) variants, as well as the B-52 competition's Douglas dark horses jet powered bomber versions of the DC-6. I know there was the DC-4M Merlin powered & the Carvair ferry versions of the DC-4, firebomber versions of the DC-4, -6 & -7, there was a potential proposed gunship version of the C-118 during the Vietnam war era, & how could we dismiss that jet version contraption of a DC-6 or maybe DC-4 used in the movie "Fate is the Hunter" & a bomber version of a DC-4 I read about somewhere in the B-29 competition, which I now believe was a mistake on the bomber version of the DC-4E. So, since these designs seem to be quite adaptable, were there any other designs based on the threesome?