.About the Nostromo deck plans. Chariot of the Gods only shows the A deck. The recently released blueprints book which I highly recommend shows the other decks and I was very pleased with it. You can sort of run your finger over it and go "This is where Brett was taken, this is probably the hallway where Ripley saw the alien when she tried to get to the escape shuttle.." etc. The A deck in that book is identical to Chariot of the Gods I think but you see the other decks and how it all fits together.
You may want to check my Nostromo thread in the General forum. It's fairly low down on the first page.
In it, I address Graham Langridge's blueprints book, ALIEN: Isolation, as well as a number of other sources.