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to confuse things even more, you could put an 8" lintel at the wall position in figure b, and your head coverage would be 120ft2. as the 8" lintel would then define those two areas as compartments according to 3.3.6.

A mechanically (spring) assisted utility vault access hatch is the direction you should look if weight is an issue.

this is a hanging automatic fire extinguishing sprinkler. goes on top of a fire extinguisher. used in Asia mostly. Interesting find!https://files.engineering.com/getfile.aspx?folder=5878c2c4-9fc2-4f72-8009-1a24ee9b0d6e&file=automatic_extinguisher_valve.jpg

AquaMist or "fog" systems supposedly do no/minimal damage to electrical components while still being a 100% water based system. The AquaMist ULF system is even FM Approved for Data Centers. The Downside is the systems pressures required are high 7-12bar (100psi-175psi) and may not be reachable...

I would argue that it isn't storage at all. It's still hydroponic beds growing the product, OH2-agricultural facility. The stacked beds are just obstructions to the above coverage, apply obstruction rules. If the product was processed and on those racks, it would be storage. If it was any other...

Not enough information. I would say see NFPA 13,(2013 is the year I have on hand) 8.6.5.1.2 and FIGURES 8.6.5.1.2(b)(c)

NFPA 13 only covers storage configurations up to and including 40', depending on your code year. For storage configurations above 40' you must follow the listing for the specific sprinkler heads.

You could argue that "NFPA 13, 2013, section 8.5.5.3.2 Sprinklers shall not be required under obstructions that are not fixed in place, such as conference tables." could apply to this situation, but a giant leap away from the (probable) intent. This is an interesting exercise at least, you...