I know a number of design groups within the Museum industry I am about to send this post to them very interesting. I proposed a similar product, zoned information, but with the use of bluetooth for a project ten years ago. Sadly that never happened as it was for a big mobile phone company just as they bought their 3G licenses and at the time you would have had to lend the visitors devices...QRs are perfect as most mobile devices will have the technology built in.

Though demographically I wonder if the museum users would have such technology...that is not to detract from what is a really good idea, just merely problem solving questioning.

Good Luck