This book gets some great reviews on Amazon. I'm going to add it to my wishlist.
From the book description: For the first time, a book has been written that explains all the tools and techniques necessary for successfully building models with brass. The detailed text is illustrated with over 320 color photos. Whether substituting for an existing plastic model kit part or assembly, making a master pattern for casting, or creating a complete scratch-built model, the range of brass fabrication methods and tools used are explained. Readers are exposed to every technique for cutting, forming, fabricating, soldering, and final finishing of commercially available brass stock. Specific chapters focus on the use of various tabletop machines and chemicals to assist readers in the creation of very detailed brass models.
Here is where you can order Model Building with Brass