Constructing Water Towers

In this lesson students are challenged them to build "water towers" with the following very limited materials:

Pieces of manila folder:
    6 1/2-inch wide by 11 3/4-inch long strips
    4 1-inch wide by 11 3/4-inch long strips
    4 3x3-inch squares
Scotch tape: 
    36-inch long piece
Steel nuts:
    4 3/8x20 steel nuts (fairly large, I'm guessing on the size)

The nuts had to be supported at least 9-inches above the shake table platform. At first I thought that the task was impossible, but the students came up with a lot of good designs and almost all passed the shake tests.