Time to practice:

1- Create a row of your preferred bench with 5m /14ft distance between. Place it in your desire place in the project, considering a distance of 0.3 m/1 ft with curbs/ edges of the surface.

2- Apply curve boolean command in Rhino for creating the platform, win the place that is indicated in the image. Create a surface with planar curves, and then extrude surface to the elevation of 0.8 m/ 3 ft. In this way you create a platform in the middle of the site.

3- Draw a profile in XY (from top view) for creating those long stairs in the middle of the site (see the image). Apply the path command to create that stairs.

4- If it's needed, change the material, justification and smoothness of the path from the edit panel.

5- Create other walls and curbs with 0.2 m/ 8 in thickness and the indicated height as you see in the image.

Leave me a comment if you have any questions!