EAS is ok.
You should check out the Jackill website. He has been doing books on the designs for Star Trek and many other Sci-Fi shows. His shematics are the best I've seen. His books also have a ton of other information that would be beneficial to any would be starship designer.
Personally, I have all of his old books. They are really well done.
http://www.jackill.com/JackillHome/JackillHome.htm