I would fabricate/make this on a roller tensioner out of 2 pieces of aluminum.
Cant to the wall for attachment, weld in the middle and hook two brackets to the rafters.
Paint the whole thing with a bright color powder coat afterwards.
Totally whether I like it or not – with a tin roof, I would definitely also think about how it behaves when it rains. It can be quite noisy. If the bedroom window is next to it, I would definitely consider something else.
With a roof like that, you will definitely draw attention to yourself.
How will the water drain from such a roof if it all goes up?
— Statics? How will it go up?
— What material should it be made of? A roof of sheet metal, and underneath it?
That reminds me of sacred buildings in Asia. Is that what you want?
Very.... interesting. It's a matter of taste... it wouldn't be mine. I don't think it would go with anything else.
I would personally start with concrete slabs or terra cotta tiles before proceeding with a canopy.
If you cut and shape two thicker sheets and then weld them together with a center seam, you don't need a substructure. It just needs to be done fairly accurately, but then it would be a highlight in terms of craftsmanship. I wouldn't worry about rainwater. I wouldn't keep the roof width at 1m, then there should at least be a dry place to find the keys when it rains when the wind is not too strong.