The looks on the faces of the uninitiated, especially gazing at the opened-up K2/100 and the operational unit driving the lightbulb, were priceless. Common questions were: How hard is it to build? How long does it take to build? What do I need to build it? What is in the basic K2 and where (in the opened up unit) are the options? What options should I get? It was great fun! 73, John Jamestown, RI