We are accustomed to teaching with a model in front of a child, but these instructions should make it so that anyone can build one without our presence. We urge that parents and teachers be there to guide – but to allow the child to try to let the materials (and a picture of the final product) guide them. A wrong direction is always un-doable until you've glued something.
The Parts.
Step 1. Place the two large blocks (pediments) into the pockets in the base. Make sure they are seated fully.
Step 2. You must lay the base assembly on top of the diagram of the bridge. It must be flat on a surface therefore the back side of the base may hang down off the edge of the table or raised surface. Place the small pieces on top of the diagram working from the outside toward the center. The shapes must match the diagram.
Step 3. When you get to the center, you must place the Key Stone into the space left for it. It will be a tight fit but if you have pushed all the other pieces in place tightly, it will fit exactly.
Step 4. It should look like this (except there should be NO spaces.) Push it together well
Step 5. Tilt the whole assembly upright. Now test it to see how much weight you can put on it. Neat huh?