Hi,
you'll have to seperate the parts of the door panels by drilling the plastic welds. After wrapping each part with leather, or alcantara, or fabric, the panels have to be plastic welded, or glued again.
Therefore you use a special plastic welding tool and special plastic paste. Or a special plastic glue.
For example search for Würth REPLASTeasy, or plastic repair sets.
Professional plastic welding tools are also often used to repair ABS - for example ABS frascias.