I don't know how much help this will be, but... The Science Centre in Vancouver, BC (sorry, I don't have the address handy) did an exhibit earlier this year on the Lions Gate Bridge, the connection between Vancouver and West Vancouver. It's undergoing investigation as to possible replacement or enhancement (developer sorts want to replace it, preservationists want to build another elsewhere or something). The exhibit included a section on the history of the bridge, the options for its future, and a section where one could try to build a bridge that would actually stand up (lots of stuff on design requirements to learn before you could get very far). I thought it a fairly good exhibit. You might want to try and contact the Centre. Eileen Mak Dept. of History UBC