Funnily enough, I'd reached the same conclusions then read your post, so our thinking chimes on this one. I'm moving the Hyperspace Jump Unit to a sidebar of it's own, as it will be directly selectable in the main 3D view anyway. So now there will be a 'Set as H-Jump target' button added to the Cartographic Display. I've been tempted to make the system map full screen too, something like the quite pleasant one in Frontier (now also in Elite Dangerous) although there is a counter argument for not revealing too much before the player gets there, so there's a possibility that it might be dropped altogether.
I'm going to experiment with slightly more detailed crew heads, which may allow for their use in displays. I have tried some icons along with the readouts before and it just added to the clutter. The Life support screen does change quite a bit so I expect that will have some significant alterations in the future. There will also probably be a dedicated Cryogenics Display as well as a Crew Roster, something a little like the DF job/role list I expect.
I've got a big ship going which is very loosely based on the wedge shape of a Star Destroyer. If you check
www.spacedeath.net you can see some screenshots I uploaded some time ago. We still need to do some more optimisation for drawing all the parts on screen. I'd like the game to cope with hundreds of crew but we'll have to see how it runs!
I'd like it to be able to deal with an Enterprise like ship at the top end, I think anything more would overwhelm the player and most people's computers. I'd probably try to keep the crew numbers lower than they are in a lot of science fiction, so I doubt we would want to deal with numbers in the high hundreds. I'm aware that the Enterprise had around 600 crew but really, when you have to deal with encounters with other ships I think that it would be unworkable, unpleasant. I'm more a fan of keeping the crew down to between five and thirty so as to personalise and value the crew, but it could be great fun to have a big ship with loads of marines on board.
TLDR: Big ships, lots of crew possible.