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I'm planning to build a backyard box soon, so I've made a google sketchup
project. what do u think about the dimensions and stuff?
[URL=http://img371.imageshack.us/my.php?image=moxxxic1.png][/URL]
Everything seems fine...I think you will have lots of speed with a 12 foot down ramp...Make the box longer you will regret it being short...at least 20 feet. sorry i don't know the meter equivelants