Nice job, John!
I've wanted to create a box maker for years. Before Visio 2013, I figured I could use .NET to export and transform flat, straight-on images inside of Visio.
With the new 3D stuff, we should be able to build an interactive one, once the images have been worked into "smart faces". I think June has already done the work for dynamically changing perspective in some of his other posts (didn't he make a spinning airplane or something?)