Sounds like a fascinating experiment, but you’ll want to run a full structural audit first—those old metal casings can rust faster than you think. I’d set up a spreadsheet to log every pH reading, temperature, and moisture level, and maybe plant a nitrogen‑fixing cover crop to offset any microplastic leachates from the metal. Also, if you’re going to repurpose a war relic, make sure you document the conversion process so future recyclers can learn from your data. Keep the data clean, and the soil will thank you.