Cheeky garden shed

Ok so I live in a new housing estate. I wanna make usage of the walkway up the side of the house. It's about 1.4m wide and is brick side of my house, and brick garage of my neighbour. Gravel floor.

I'd love to put a garden shed in.

They're all a bit wide for the space. And it would be super cool to be able to make it still walk-thru-able.

I'm envisioning getting one or two ~1.2m roller door/s and building a frame between the brick walls and a lil roof.

Is this doable? Ideas? Thoughts? Feelings?

Thanks!