Educational Gaming Commons - Press Start

I've been spending some time learning to build and script. After several months, I'm getting fairly proficient. The included pict shows a rocking chair (that really rocks), a Grandfather clock (that really works), and a Trombone (that doesn't play). The chair took the longest - I was just learning. The clock took a long time due to it's complexity - plus I wanted it perfect. The trombone only took about two hours. That surprised me, but I am getting a feel for how to approach a build. I left the spit-valve off - why bother?