John Brock More about John Brock John Brock has been a custom home builder and designer for over 30 years, in and around Smith Mountain Lake, VA. John is a 3D modeling expert and author of "SketchUp for Builders", as well as software developer of SketchUp Extensions (Estimator for SketchUp, Framer for SketchUp, etc.). John is passionate about 3D modeling and visualization of construction projects and is also a consultant to other builders, providing Constructability3D modeling services to fellow builders across North America, saving them time and money by identifying issues and mistakes before they become unnecessary expenses.