Happy 4th. :)

The rails were a helix on the side, a flat helix on top and projected onto revolved surface. The revolved surface was a cylinder with a domed top, and a fillet around the edge.

Thanks Nick,
Thats a way to get odd yet precise curves. Thanks. I also tried just drawing it. I could, yet wasnt sure how to be precise or if my thinking was the best way. Both yours and Michaels way were great help to me in my learning!

Thanks,
Burr