My Bridge

For my physics class, I need to make a bridge to support quite a bit of weight. We must use balsa wood and only glue as an adhesive. Also, the bridge can't way anymore than 100 g total. I'm not that far into the process. I have created a diagram with all the measurement for each piece and I started making the base of the bridge. I'm planning to make a Warren Truss bridge with 5 supports underneath to help even out the pressure and help absorb the the compression from the weight. There are two things that I'm worried about. One of them is not going over 100 g. And the other is hoping my bridge won't break before the competition. Other than those two things, I feel pretty confident with my designs.