I'd like to solicit the opinions of all the skilled camera builders here.

If you were to build a "one-shot camera", how would you go about it?

A one-shot (tri-color) camera takes 1 exposure but exposes 3 negatives at once by splitting the light with 2 partially silvered mirrors. Let's assume the mirrors are easy to get and that the geometry could be easily calculated. How would you achieve the precision & rigidity to assemble something like this? Would love to here your thoughts.

Some inspiration here -> http://www.vintagephoto.tv/bermpohl_img.shtml