Hey,
I've read about a paper 'kit' (actually a book with over 600 pages) of a merchand ship that really has all the decks and all the bulkheads in it, when built it is over 2m long and it costs well over 300 $. Unfortunately I don't have the link to show you.
I Asia papermodeling is also huge, check out the next link, you'll find litterally hundreds of models to download for free (and yes there are some tanks in it also)
http://www.3dpapermodel.com.tw
My wife and I have built some of the models and it's great fun, also the result good...
Have fun