Actually, THIS is a prototype Starship that will never reach orbit. It is designed to fly 20 Kilometer up in the atmosphere and land near where it launched from.
Yes, it was built literally in the backyard. We have to assume the version of the ship that reaches orbit will be build with bettr precision. Musk himself said it would be and side they's used thinner skin and not nearly so many welded joints And the ship that flys to orbit will have a heat sheild made with glass tiles.
What you see in the photo is an early prototype.