Nice work.
See the nice, dark, coniferous area woods ?
I'd use matching green paint on Yang Ming, with a white roof to minimize summer heat. Airtight steel containers can get hot.
Build a run of top-to-bottom shelves along one wall, both walls if stored parts are relatively small, back wall optional.
Bury a wire from the garage for a couple fluorescent ceiling fixtures.
And yes, keep close track of what's in there, or leaves.
Next.