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Create a kit a for students between 3rd and 8th grade to learn about forces and structures. The kits should allow to build a structure across two table or stable surfaces with a gap upto 20in. Budget it 50$ for the final design and 75$ including the prior 50$ for prototyping.
Part 1: Kit for students to build structures
Part 2: Weight application and display device

Our design has a projected cost of approximately 40$. 
Solution:
Part 1: 3D printed joints and hot glue sticks for members
Part 2: Piece of mdf above the structure with a 2L bottle suspended. The suspended bottle is filled with water to add weight by means of a tube and syphon pump connected to a seperate bottle.