How would you like to see the big ships done?
No deck plans. You can't get any usable detail. Instead, just make a few examples of typical layouts (done top-down and not isometrically). A corridor of staterooms (possibly different types) so show an example of what they look like. The layout of typical barbettes and bays. Examples of workshops and labs.
With the current big ship plans, all you get are very general ideas - this section is crew quarters, that section is main engineering, etc. Which isn't necessarily bad, but anyone interested in doing something inside the ship needs more and are still going to have to map it out himself. For those that are only interested in running the ship in space combat, deckplans are not needed and are just wasted space.
As for the actual ship stats themselves, a column listing the power requirement of each component might help. Particularly weapons (everything else is generally covered by the current power section). Can help if you don't have enough power, you can what everything needs at a glance so you can see what to shut down or what is needed. Not really necessary, however.
An actual crew total would be nice, as opposed to going through and adding up each individual section. So listing somewhere the Tigris, for example, has a full crew of 8,215 plus 500 troops. Having each section (engineering, pilots, gunners, etc.) listed is fine, but a total would be nice as well.
For the most part, the actual stats are fine. It is just the deckplans that are the problem. Though I am sure there are people happy with them. You can't please everyone.