OP, I just checked your calculated DoF numbers. More exactly, I put 4x5 film, 58 mm focal length, f/22 and subject distance 80 cm into the calculator at dofmaster.com.
It returned the numbers you posted, also told me that the circle of confusion's diameter is 0.1 mm. I don't know where the person who wrote the calculator got that CoC, but it seems a bit large for anything but contact printing.
If I were you I'd reconsider how much DoF you'll get with a more realistic CoC before proceeding. And unless I were dead set on making the camera myself I'd look at this:
https://www.maleficwares.com/malefic-4x5
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