Love it!
Very original. 
It – idea for the concept of your site. Or it can be used as separate elements, alongside with others.
Each of mechanical clips – divided(shared). That is, you can take for the concrete project only one of them. Near to a clip there are the managing buttons forcing it to move upwards and downwards and also to stop. And more to the left from these buttons – the manager movie-clip ” direction clip ” containing important action scripts. In it source I have left its seen and even have signed, that you have noticed it more easy, But in your film of it it is better to hide, since it only functional, but does not carry visual utility. To hide it, it is possible or having painted in color of a background, having removed abroad coordinates or as you usually act.
By the way – all this together weighs only 30 kilobytes -)
The device of these mechanical “carts” very simple, I think you not will reach weariness while will disassemble with them 
Good luck!
