Building a 4eyes pinhole camera (part 1)

I'm thinking about building a wooden large format pinhole camera with 4 pinholes. Before I start, I would like to ask you all for help/tips/plans/experiences with these kinds of designs. I can make things out of wood, but metal works I don't know nothing about.
This is the first design drawing. The dimensions of the camera will be: 410 x 410 x 70 mm, pinhole size = 0.35 and the angle of view will be about 90 degrees (per image). This will give a f-number of 200. I need to work out the details of the interior of the camera next.

These are issues I'm thinking about:
* Can I make a simple shutter meganism to operate 4 shutters at the same time?
* Should I make a division inside (like a cross) to avoid the 4 images to overlap?
* I want to use a sheet of photographic paper so it will be a oneshot camera.
* Has anyone some spare parts I could use (I'm not a metal worker)? I'll pay for the costs.
* What am I thinking off???

Any thoughts are welcome!! Here is the first drawing: