Tin sheds are terrible, the self assembly variety anyway, your takeaway probably arrived in thicker metal.

They line up terribly when assembling then rain inside from condensation.

Used to be place that made motorcycle sheds from shipping container panels sliced down a bit, delivery by hiab but with boxes over the locks , puts off the passing thief...

Timber with insulation is good option, bit of protective planting around perimeter to deter visitors, hawthorn, holly , climbing rose :-)

Size does matter..