What a great idea! A tip: what is shown is what is called a plowed rail (it has the hollow, or plowed out, area in the bottom of the profile). You want to use this style. There is an unplowed style, with basically the same profile, but is not hollowed out in the bottom, and it is a little narrower. Because the unplowed rail is a little narrower, it can rock and tip easier than the plowed rail.