Positioning and orienting a unit of a hearing device relative to individual's head

A method of manufacturing a hearing device comprising:

• adapting said device being adapted to be applied with a shell to an application area at one ear of an individual, said device comprising the shell and a unit in said shell, with the constraint that when said device is worn at said one ear of said individual, said unit has to be located at a desired spatial orientation with respect to a distinct area at the individual's other ear, the method comprising:
• establishing a first orientation system remote from said application area at said one ear of said individual and linked to said distinct area at said individual's other ear;
• establishing a desired spatial orientation of the unit relative to the first orientation system and providing and preserving first information defining localization including orientation of said unit relative to said first orientation system;
• generating a digital model of the application area for said device;
• selecting a second orientation system at said individual and linked to said application area,
• wherein said second orientation system is selected to be based on a sagittal plane of said individual, and
• wherein said first orientation system is a further unit at a further hearing device, further comprising
• providing a digital model of said sagittal plane in said digital model of said application area;
• generating a digital model of a further application area for said further hearing device at said individual;
• mirroring said digital model of said application area at said model of said sagittal plane resulting in a mirrored digital model;
• bringing said mirrored digital model and said digital model of said further application area digitally into a best-possible mutual covering position;
• modeling said unit and said further unit digitally in said models in mutual covering positions;
• mirroring back together said digital model of said application area with said model of said unit at said model of said sagittal plane;
• providing and preserving second information defining localization including orientation of said application area and of said first orientation system relative to said second orientation system;
• generating a digital model of said shell with said unit in dependency of said digital model of said application area and in dependency of said preserved first and second information;
• and
• manufacturing said shell with said unit in dependency of said digital model of said shell with said unit, thereby establishing spatial orientation of said unit within said shell so as to establish said desired spatial orientation of the unit relative to said distinct area at the individual's other ear as said device is worn by said individual at said one ear of said individual.