empty space? you should take account for construction and plating thickness instead.
https://dl.dropbox.com/u/63276563/Foto0040.jpg
this is the forward section of an medium sized inshore pusher tug I have welded parts for. you see part of the construction of the vessel. see how complicated it is?
ok. now let me hear how you have accurately made estimations on the weights of that carrier of yours. also, of it's stability (which you have told nothing about, and which is what you should have checked as well)
first thing to check is to see if the construction + fuel + ammo + engines weight is not going over the displacement. second thing is to check stability. as far as I can see, you have done nothing of it. if you have done calculations, (And I still seriously doubt it) you have wasted paper. note also that the howto of the above methods are actually on the bucket.