What engines?
If steam, than you can leave the one you've already got.
If diesel engines, than may I suggest looking at the Deutschland (Graf Spee
Here for inspiration.
Oh, I already know quite well what the Deutschlands look like.
In fact, I have long had them as the follow on class to the Matchlesses, where the RN learned from all the mistakes made in the previous class and corrected them into a more usefull form as Colonial squadron flagships. (been working on the composition of my navy since '03 when I started NS, from 1885 to present. Eventually I'll extend that back to before 1800.)
EDIT
OK, I've solved that pesky "steam vs Diesel" debate....