This is a school science project Suspension Bridges. It was selected to represent my school for district science fair. We made it from square wooden dowel, plywood, small chain, foam board. All materials easy to find at a local hardware store and around a house. For gluing we used combined hot glue and super glue.
The size is in inches, but the size does not really matter , you can use your imagination how big you want to build it, it will work in any size. For the truck weight (to make the truck more heavy) we used large metal nails (spikes) cut them and glue them together.