Buy or build?

1) Professor Matt Anderson at SDSU independently developed a lightboard which he named "Learning Glass" (pictured above). His group is offering complete packages for sale, through their company Learning Glass Solutions. These packages include a board up to 3x5 feet in size, in a variety of configurations, including sound, video, and lighting.
2) The other way to get your own lightboard is to build it, using the instructions and parts lists on this website (or Learning Glass's).  The plans here are intended for a chalkboard-sized lightboard. The cost is about $10K, and you wind up with a studio, with really good lighting and really good sound. Most of the parts are easily obtained commercially. For the glass, you will need to contact a local glass company, to obtain unmarred, and tempered, glass. 

3) The frame is available as a kit (options shown below), shipped to you to assemble.  Kevin Koch, founder of New Revolution Tools, sells easy-to-assemble frame kits in 4x8 and 4x6 foot sizes.