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One 50mm hole through the centre of each 20mm thick plate. A single M48 threaded rod through all plates then support the plates on nuts and washers spaced 120mm on the rod. Simple.

'Best' is very subjective. What does the assembly need to do? Are the plates resting on the bolt-pillars or hanging from the top plate?

A very large bending moment would be my guess! The formulae in 7G allow you to calculate the compressive stress at the torque shoulder due to make-up torque. So I suppose you could use the ol' Euler-Bernoulli bending calc, treat the box and pin like one continuous pipe, and work out the bending...