I think i get it most of what i needed. The only thing i am unsure of is how to you make railings be evenly spaced between two splines? One spline represents floor height, and the other the platform height.
The gist would be this. Clone the segment, every 10 feet, along this SplineA, and make it as tall as SplineB.
Is that possible? If ti is, then I could extrapolate the rest.