question: where do you base those parts on? because.......
the hull design of you DD looks like an pre-WW1 destroyer. the size says the same. however, most if not all of your weapon systems are of WW2 vintage.
https://dl.dropboxusercontent.com/u/632 ... ie%203.png this is an work in progress of my own part sheet works for
viewtopic.php?f=13&t=5275 these ships. as you can see, more then half of the entire ship is dedicated to boilers and turbines. the smaller you make a ship, the bigger the machinery becomes relatively. also, the abovementioned destroyers are based on WW2 tech, which was close to the best you could get out of given size steam machinery.
I applaud the fact that you are thinking about what is in the ship though. the first step is thinking, the second is knowing. if you have any questions, feel free to ask them here or PM them to me, if you want, and I will see what I can do. there is, however still much to learn