Drawing of the mechanical heart - research

Am currently trying to design the mechanical heart. I envisage cogs, hammers, levers pulleys some sort of clock work or maybe an hour glass? Victorian obviously! Would like to animate it in Flash to have as part of the introduction while the GPS is loading. Really need to have the narrative now to be able to start properly.... Designing when you don;t fully know what your designing for is tricky. But I can work on aspects of the animation which I know will be in there. Have started on the logo design as well as the general design. The characters will have to be done at a later date when the narrative is fully constructed and the relevant parts are split up into their relevant sections. How many drawings will there be? How many animations? How much written text? How much video? How much will need to be on one page or screen? Audio how much written text will images go with this also - will they be imperative the story or merely an extra should the viewer take the time to find them? Hidden parts? Extra bits of information for the more enquisative? The website? How much back information? The list is endless....