1 + 1 = 3D

Konica FS-1 was introduced in 1979. This was the world's first SLR camera with a built-in electric winder. The modular design of the camera makes it quite easy to hack.
Cutting cameras bodies
The body is made of aluminium alloy which is easier to customize than plastic. The two cameras were cut and then screwed together. Plastic Padding was used to fill some gaps and holes.

Mirror housing Electronics
The shutters, automatic exposure and film advance are electronically controlled. Basically there is just one set of FS-1 electronics (with some modifications) controlling both cameras.

Junk Cover parts were screwed and glued with epoxy. Plastic Padding was used to make up the finish and several layers of black paint restored the look of the surfaces. The back cover (film door) is originally made of sheet steel so it was easy to silver solder. I'm glad it wasn’t aluminium - that would have been hard to splice together.

I would really like to make a digital 3D camera. But it is really hard (I hate to use the word "impossible") to merge two digital cameras. I can imagine putting together two cameras and have them act like two separate but fairly well synchronized units. They would have two memory cards etc because it is hard to hack the firmware. It would be nice to have a 3D LCD as well. Such displays exist, but again, the challenge is to hack the firmware. The best approach would probably be to build a camera almost from scratch.
And yes, there were some pieces left over...