Ian Weekley's classic wargame models are described and explained in this 128 page hardbound book.
Although somewhat dated, wargamers will find a wealth of inspiration and tips. Construction details with both B & W and color photos of every conceivable type of castle and tower that you would want in your game are here. La Haye Sainte and Hougomont are detailed as well.
This book is in Very Good condition. There is some minor wear.