Has anyone got advice on the foam incline sets

[RailCop]

Very good point on the length of the 2% but in my case I have nearly 20 feet to work with so I believe I should be able to make it. I have a 5' x 9' penenusla where I will lay my grade. It will start on one side, run nearly the lenght of the table, curve around and back to it's summit. That's just shy of 20 feet but will have a 180 degree curveto it (Horseshoe Curve? Naw.......single track)

Thanks gang,

KT