I love this drawing! You're rendering of the Mamiya is wondrous and the reflection of Rube in the glass of the lens is an amazing touch! The masking liquid is a great revelation. I want to try mucking around with some if I ever get back to drawing. I can see why Mioko would cherish this camera. Pure awesomeness!
I assumed you had a Mamiya at some point (or coveted one), and that is how it found its way to being Mioko's camera.