I have the book and sinking model of the Titanic. The book is pretty good, though I have only flipped through it and have been meaning to read all of it. The model is very good and it's a lot of fun to build. In my opinion, it really does show how the ship sank that night.
I've had the following model book for a while now, bought for a bargain £1.99 from Worcester:
Make A Model - Titanic, in the Parragon 'Make A Model' series. ISBN 1-85813-294-0. It includes the Titanic full profile, with a cutaway section at the rear; the Titanic about to go under with the iceberg and lifeboats nearby; and the bow section as it is now on the seabed. I haven't built it as I haven't seen the book since.
I bought this one from Cologne in 1988 and again haven't chopped it up because I don't know if I'll ever get another copy:
Titanic - Zum Selberbauen, published by Taco, ISBN 3-89268-011-6. A very detailed 1/200 model in card, even with rigging and deck benches! All instructions are in English, German and French. If you can get hold of this book, I would recommend it for anyone who wants a fully detailed model but doesn't have Astor's millions.