I'm tinkering again

I've been tinkering again. I am preparing for a weekend photo shoot in Joshua Tree at the beginning of May. I've signed up for a class through Creative Photo Academy which is associated (and located next to) Paul's photo - a local photo shop. We will be learning astrophotography in one of the best dark sky places around.
I want to take some photos of some deep sky objects like the nebulae of Orion and the Andromeda spiral galaxy. Unfortunately those constellations set early in the evening, so my time to shoot them will be short and the exposure not optimum. I will use this as a learning event and return in October when there are better celestial conditions.
I have been working on building a star tracker EQ mount from a hinge and a DC motor so I can have my camera follow the stars for long exposures. I found the plan on makezine.com  and it is lots of fun. I put a picture of the finished project below.