Put one in the yard and call it a shed. If you put things in lockers ("storage cabinets"), they would be none the wiser.
Check out the MarketPlace on their site. The Eco-Shells are the non-insulated versions.

Disclaimer: I am in no way affiliated with Monolithic, INC or any of its subsidiaries. I'm just a "dome nut".
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor