If you see the mirror dimensions the width is 1160mm and with opening It is 1200mm with both doors opened, so we need to give slightly more than 20mm on each sides, so the doors can be opened properly.

No, this is fixed.

The minimum length required would be 1300mm

No we wouldn't recommend this as this may obstruct the door opening correctly.

You are not able to change how the doors open.

It can be fitted on a stud wall but would need the correct fittings.

All of our mirror cabinets have doors which pivot outwards which means they can't fit in a recess.