may I grant you a few tips?
first look at it's role. what is it supposed to do? on that you base the size of the helideck, the no and types of weapons carried, radar system and the propulsion. from that you start with adding the propulsion train (cooling for reactors, funnels and intakes for turbines, etc) and then you try to fit in the radar system.
if you have done that, you can build an hangar and bridge on it, add cranes/rhib bays, masts, railings, cooling etc.... and then you are mostly done