So with the latest update introducing Large Storage Silos, I think it's now possible to make superstorage on a single Extra Large Platform C - With the right stuff, it can hold 1152 Tier 1 items.
No, I'm not joking.
It uses an Extra Large Platform C with 4 Large Storage Silo Bs, each with 12 Medium Storage Silos.
If you're interested in the maths to check on it... get outta here you frickin nerd
(I haven't actually tried any of this yet, this is all in theory, but nonetheless sensible)