That is insane! Incredible. Maybe there is hope for me - I have the same stereo microscope. (Ha!) I don't have the thousands of hours it would take - the action, the carving on that one, zounds.
I played a Young Chang years ago - it was a respectable piano. I touched a Bösendorfer once.
My piano tech said the Baldwin pianos have gone downhill over the years, is that right? Perhaps I was fortunate to get mine when I did in 1980. Especially for the cost - I simply cannot believe the prices for new pianos today.
I've afraid this thread has diverged quite a bit from the OP's music box project. To get back somewhat towards the subject, I planned to make my piano music box with a thin glass piano-shaped plate to let the action show after lifting the lid. To fit the movement then would require either cheating on the case height or making the whole thing a little larger in scale.
JKJ