This is such a nice kit! Even nicer is where it came from - the earlier Revell DC-7B kit! That kit was modified to 'become' a DC-7C. In order to do that Revell altered the mold (forever!!):
1. Saddle tanks were added to the engine nacelles.
2. The wing root was extended.
3. The fin was made taller.
4. Three windows were placed forward of the propline - the 7B issue had two windows.
HOWEVER - the most glaring fault was that the fuselage was NOT extended the proper 40" (to accommodate that third window)! It's easy to understand why - this would have made the kit fuselage longer and it would NOT have 'fit' into the standard 12" box!
Uh-oh!
Considering it's odd scale and the times and it's not too surprising and overall the Revell kit is both gorgeous and a disappointment. The original -7B, however, is quite nice - if you don't mind the scale.
On a side note, the original issue -7B was the first Revell kit to feature the 'S' on the end panel (for their Styrene cement!).
I have seen industrious modelers who have added that forward section and attended to other details to finish out the build - and it looks great!
It was also a disappointment that the -7C wasn't offered in a US airline livery.
Michael