iOS App with Unity argument reality, Account system

Hi, we need a iOS app to present our customers our building - the best way to use is Unity here: That means : - a welcome screen where the user has two options (example model / account model) Option 1 example model - a example 3D house (stored in app) will be loaded - the user can set scale/position/rotation per UI - he can walk in the reality to the house (not more) - in this view he can change the floor (should be separated models) - sun modus: he can start a separate sun modus. Orientation of the sun is taken local of the iOS device. Than he can change the time in 1 hour steps Option 2: - Account Screen (Name/password) + Button for link of my website - If account ok see a list of available models (local + Dropbox) - Dropbox ftp and one folder for every account - possible download of models - choose one of the models - all other same as option 1 Best Regards Mathias