That is a nice thing, Sharkie. I will be reading his other books.
I have sort of invented my version of Rose, based on her first year. the year with Bennett.
In the beginning, sort of in third person through the eyes of Lockhart, she has a mast in front of the bridge, which makes her the early short forecastle design.
She has the 2 pounder Pom Pom, which is a slightly later fit than the other AA set ups. And she has "light machine guns" on the bridge, the Lewis fits.
What we never learn is her pennant number. In the movie, she is K49, HMS Crocus' number, although the ship used was K32, HMS Coreopsis.
Absent any other good reason, I'm going with K49.
So, the rebuild to a short foc's'le gets started.