Nothing wrong with a small one Hugo
The hull you have drawn looks much faster than the speed you have given it. You have a lot of space between B turret and X turret which would normally be used for machinery rooms. You have more space available than would be needed to make your ship go 24 knots. Using UK powerplants of the time, you could fit 75,000shp in that space which would get your ship out to 27-28 knots. To get to 24 knots you would probably only require 45-50,000shp which would leave you a lot of unused space.
Har har. I suppose you're showing me how to use what I have?
I left a margin in the springsharp report of .10 CS for future modenizations, but using those I managed to get her up to 26 knots instead. Still, I don't think the space for improvement is a bad thing. You could of course have a point in that it's space that wouldn't end up being properly used either way, unless an increase in engine size and power is made, and that it results in a waste of displacement used for nothing.