I too have little knowledge of the tech side of these things, but a lifetime love of the DC-4 / C54 ??? my photo of one of the pair at North Weald shows what looks like a pair of non standard windows (as well as the dome) above the crew positions, this is not present on the other NW example ?
Could this be one difference between the DC-4 and the C-54 from production as such, I seem to think that most US military 'heavys' have 'look up' windows ???
Keith.
