Are you after an Alucobond type of facade? Say following a typical layout like this?
BTW: Obviously we are talking modules here and not just curves like the ones in the tree. Plus stuff having some remote relation with reality around the openings. Like:
So in general you need 20-25 cm space as follows: 40 cm for the panels/fasteners, around 60 cm for a proper fully adjustable support system plus 10 cm for some decent thermal insulation (the best by 1M miles: Foamglas [with one s]).