Wow Chrisb222 , that is an amazing solution! Seems like an issue that shouldn't need an amazing solution, but thanks for sharing!
Here's my summary of what you are telling Chief to get the desired result - is this right?
1. Make a single rail on one side as high as the thickness of the deck material
2. Give it a bottom rail but no top rail and no balusters
3. Make newel posts the same thickness as the gap you want between boards
4. Make newel post spacing the same as board width
5. Make bottom rail same width as ramp, the same height as floor material, and offset to middle of ramp.
6. Use material in spec dialogue to Change newel material to insulation air gap (invisible material)
7. Use material in spec dialogue to Change rail material to material texture you want for ramp floor
8. Use adjust material definition rainbow icon to rotate material in texture dialogue.