looking for piano technical drawings

[keys4free]

hi chaps!

I'm a music student but also an architecture student and i'm trying to get my hands on some technical drawings of piano's (sections/isometric/plans...) old or new will do. 

Old original drawings by Bartolomeo Cristofori or other piano dudes would be awesome..

Also technical drawings of other musical instruments (saxaphone, clarinet, cello...) would be great - i'm looking for books and websites.

Thanks a lot!

Martin