Some of them would be virtually impossible to build with Lego, as they rely upon machining just not really available in the Lego space (unless there's a wizard

Some of them would be virtually impossible to build with Lego, as they rely upon machining just not really available in the Lego space (unless there's a wizard of Lego out there that could fashion such parts using certain strange Lego parts from certain sets, like the Bionicle series and such). But a lot of the more basic mechanical movements could be easily constructed; those with simple pulleys, gears, levers, etc. So you might not be able to construct all of them, but you probably could construct a great many.