Weaving

After all of my research into purchasing what I need to organize my students math tools, I have come to the conclusion that I will have to invent my own solution.

What materials will I need? 
I found that wood would be the easiest and and least expensive to work with.  I thought about taking a piece of luan and making a frame in the shape of a rectangle with a hole in the middle to drop the tub into it.  After discussing this with my husband, we decided that that type of wood might not be sturdy enough for classroom use.  The next idea was to make a frame with 1" x 2" wood.  The frame would be sturdy enough that 3rd graders should not be able to break it.

How will it be attached to the desk? 
The frame is my property, but the desks belong to the school.  How can the frame be attached in a way that is not permanent.  They can't be glued or nailed or screwed to the desks.  My husband suggested using Velcro that has the sticky back.  It could be attached to the frame and desk.  The frame would them be removable and the Velcro could be removed if necessary.  The man is a genius!