The rough rule of narrative is that if a plan is explained in detail, then when it comes to implementing that deal, it either doesn't come off, so that the description of its implementation isn't just duplication, or - because it has already been described - if it does go according to plan, it happens off-stage without further reference.
Two warship designs that feature in Drake's Drum. They were designed in our time line but never built. Top: HMS Lion, lead ship of a class of five battleships armed with 9 X 16 inch guns. In OTL four were planned and two were laid down, but wartime shortages and changes in priorities meant neither were ever launched. In Drake's Drum, five are commissioned. Bottom: two designs for heavy cruisers were prepared by the RN in 1938/39. The second was a 15,500 ton ship with 9 X 8 inch guns. None were ever laid down. In the Drake's Drum timeline four are completed and two more cancelled.