bazile I had one once and never again stick with wood if you can
there are some very good ones here not too far away ?
https://insheds.co.uk/
they even deliver and erect them for you
this is the one I got my only advice would be to upgrade the felt
Have erected quite a few for customers .. but I am afraid they often called me back regarding condensation.
If you go to look at one at this time of the year .. you will think .. 'this is very shiney and nice'.
Go and look at one in the winter and tell us what you think.
You could easily improve them by lining it with exterior ply.
But you can't beat a good wooden shed .. when putting a new shed up I always advise a customer to spend the extra and cover the roof with EDPM .. you will never need to replace the felt in your lifetime !