A few notes on ADT.
Both ADT and Revit are suppose to follow the design/build principle set forth as concept by the PhD's at the top technical universities. Autodesk got wind of their concept and bought Revit to take it to the next level. Unfortunately, they never understood the "entire" concept. They understood to concept of making objects react to each other and thought they could run with it. What they missed was the fundamental understanding not forcing the user to predefine a design and still get the manufacturing information. The reason being, at that time no company anywhere knew how to do it. That is what design/build was just a concept. As it stands right now, they are driving / creating the parts with a database. This starting point of driving/ creating voids the basic principal of design/build, as the user never really has true design freedom and can still get the manufacturing information. The problem lies in the fact that you must have the 3D distances AND associate those distances or dimensions to the Length, Width, and Thickness. Because the core modeling engine data base is really only points in space that do not have orientation information, they are just a point, no company every figure out how to get the Length, Width, and, Thickness without driving the drawing. This only applies to industries where the source raw material is solid. The rapid prototyping industry is unaffected and can do design/build, because their source raw material is a liquid. ADT and many other driven softwares can work well and automate a great many things. The problems always come up when you are creating something that the formulas were not created to handle. In building custom structures, even if you had enough formulas, the basic end user could not remember them all.
About the VB in ADT. There is only one company that has an OEM to ADT. That is Americad. I talked with them at great length a while back and they told me that their licence prevents them from adding any code or method that can extract information that is not already available through their exposed methods! What a bummer, huh?
Enough trivia.
Have fun guys,
Dave