What size structure you think they are? What size pipe? 4"? Held together with zip ties? Stuff some rocks in the base to keep it in place?

I was thinking of making a few with a 5' diameter base (about 16' in circumference) and the 4 pieces on top being 10', 9', 8' and 7'. That�s a total of 50' of pipe per structure. 1 roll of 100'x4" from Lowes yields 2 structures. Sound right?