This week I was able to solve the problem with the assembly. The reason I was getting an over-defined error was due to the fact that the end arch pieces had some geometric issues. Two of the faces were something like 0.067 degrees to each other instead of being parallel. This means that when I was mating the faces of those pieces to the rest of the bridge I would have contradictory statements resulting in the error. I fixed this by adding a geometric constraint (parallel) to the parent sketch for the extrusion and this fixed the problem. Aside from this I’ve been slowly but surely piecing the bridge together. I’ll post the completed bridge once it’s finished after spring break. From there, I’ll try and have it 3D printed at Wilbur for a small scale model the fabrication crew can use as an aid to help them build it in real life. More updates to come.