Hi Ivor,
I have plans for Type 15 and Type 16 conversions and Emergency Class Destroyers prior to any conversion.
Unfortunately, they are 1:72 scale, but a simple fraction can bring down the scale to the required 1:96.
The quality of the plans is pretty elementary and basic (A4 sheets) but they deal with all permutations of the Emergency Class Destroyers and their subsequent conversions.
If nothing else, the plans will answer some of the questions you have as well.
You are welcome to a set of copies.
Remember, there's nothing a British boy cannot do ..................
Yarpie.