you need to break your model down into elements.
- select faces then click on detach and select detach to element. so you could for example create 2 elements, on backside and one frontside
after this go through the normal process to create your template but remember to flatten the pieces so that the view being used to create the map all faces are perpindicular to the view, so that all faces occupy the same amount of surface space in that view as they do in 3d space. do this by grabbing edges or vertices an pulling them so faces show the same surfaces area in that template view. and make sure to rotate all element pieces to face the same direction.
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