I agree, The Complete Cross Sections is the best way to go. It's all 4 of the original Cross Sections books rolled into one, plus the drawings for the TIE Bomber and B-Wing. I think the entire series is a tremendous collection of work. And the books and they offer some great insight. The Falcon drawings alone are fantastic, and I think they might have served as some inspiration/reference for Hasbro in the design of the new Millenium Falcon. But to simplify my thoughts on the books? They're fun to check out.
I would definitely like to see more books in this series in the not-so-distant future. I think the Clone Wars offers a cool opportunity for that. Sure, we've seen most of those vehicles in the prequel books, but there are still some that might be of interest to fans of this series of reference books.
I actually had a chance to chat with Richard Chasemore and Hans Jenssen, the artists for these books, at Celebration 4. They're very cool guys who have a very strong background in industrial design. They were very much open to discussion at their art tables. And they gave some great insight on the development of the first book during one of the panel discussions. Apparently when the original book was in the works, it was quite a challenge for them and David West Reynolds to come to agreements about the inner workings of the starships and other vehicles.