news flash, you want to make a straight rail/box then everything will be square and the length/width you want, you wanna make a c-box, do the fucking calculations, how much arc, how much bank, what radii etc, rainbow, SAME, get the fucken tools, throw down some sketches and numbers and have at it. Have you noticed that nearly every resort builds it's shit differently, its called freestyle for a reason, make what you want unless you are that un-inventive fucken retard