its a circular rail, just going up and down the bank. pretty much a down rail

 Isn't it a kind of odd shape for a funbox? Not trying to diss your idea man, looks like a sick setup! I just think something like this (but with a rail obviously) would make more sense: www.pinkbike.com/photo/5350896

The flat section would mean you could grind up and down the rail, not just down. And nose manny the flat inbetween the banks or whatever.

 vimeo.com/25302584

look at sean ricanys yard, gunna be pretty identical

 Ahhhh fair enough. Man that's actually pretty sick! I imagined it being kinda cramped and sketchy by looking at this, but you're right, it'll work. sweeet

 gaps to flat all day!

 book, feeble the up box to eagle tuck to flat.

 cash roll whip the box jump tooth hanger up to 3 bar bar half cab flair tuck the qp to footjam whip to bar bar

 haha whats the spec?

 google sketchup, its free

 alright thanks