I had to check that I haven't had an extra long sleep and today was 1st April

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A shed, and you're worrying about it not being bang on size, it's a shed not a precision item. It's made from natural materials and can shrink or expand even if it arrived spot on size.
I'd be angry if it was a door or a cupboard that didn't match the stated size but on a shed ? Not unless it 1 or 2 inches out.
I bet you're a bugger to work for.

I get angry but more about the poor finish of bike parts. Rust appearing on components only weeks after putting them on the bike. Don't manufacturers know bikes are used outdoors.
