No. We'll have every hallway and door at least, so "none" of the ship will be off limits, however, most rooms were cookie cutter rooms and would be a waste of bricks. As far as unique areas, yes, we will have all of them. For example, we recently got a nice start on the 1st and 2nd class dining saloons, 1st and 2nd class pantry's, and the galley. I'll be working on the hospital tomorrow.
When we get a bit farther, you won't be bored and it'll be nearly impossible to see the entire thing in one visit. One of the guys I have working on the ship is still finding places he hasn't seen.
I'll be impressed if you see it all. It's like trying to New York in a day.
Edit: I hope you like to get lost.