Here is an idea for the clouds. In the current design, the tallest buildings on each side are 8' tall. If we add 2 feet to the height of the tallest buildings, we could use 10' tall 4x4's for the main structural support. This would allow us to connect the 4x4's with two ropes that would span the two buildings, providing more structural support and a means to attach the clouds. The extra height would provide enough room for the clouds and plenty of headroom for people to walk underneath.

Click image to enlarge.