agin i will agree with you on the above pic.
how ever we do not know the distance between the S.F.'s and the Prommie nor do we know the height of either of the S.F.'s.
therefore those windows could be anywhere from 4 ft tall x 2 feet wide to 8 ft tall x 6 ft wide.
I just rewatched that ep and as far as i can tell there are between 16-19 decks
at 8-10 feet per deck plus atleast 1 ft between decks for wiring, ventilation and such, plus 1 ft armor for outer hull that gives us the following
if 16 decks: 145ft(44.2m) - 177ft(54m) tall
if 17 decks: 154ft(47m) - 188ft(57.3m) tall
if 18 decks: 163ft(49.7m) - 199ft(60.7m) tall
if 19 decks: 182ft(55.5m) - 210ft(64m) tall
now you can pic from any of those sizes you want and thenuse those measurements to extrapolate the length and width of the prommie.
as the prommie looks to be 2-3 times as long as it is wide then the prommie is between
if 2 times: 290ft(88.4m) - 420ft(128m) long
if 3 times: 335ft(132.6m) - 630ft(192m) long
Personnally i am more inclined to go with the latter than the former as the 630ft(192m) actually fits the size of a US cruiser type naval vessel