I did make sure that no faces overlapped, I did that by placing (for this example, well say the cylindars holding the bridge) the cylindar there, then i cloned it and kept it in the exact same spot, then I did a Boolean on one of the cylindars, so the cloned one would stay in the exact same spot as the regular one.
Anyways, heres some pictures, I put the halo reference models there to show you how big the base is (oh, and its untextured, so if i release the model, people can choose thier own textures):





