Tell us about yourself!
HAHA, I just saw Adam Savage and Michael from vsauce build one of these quite similar to yours, then 2 days later Instructables sends me a link to yours.
YES! This is exactly what I was thinking when i clicked on this and saw was being used. Hummmm I don't have a macro rail lying around, what do I have? *lightbulb* A drawer slider that's it!! :)