There will be no stylesheets.
Use style.qml to define all properties. That in essence is your 'style sheet'. I will not integrate the other stylesheets as the introduce more problems than they solve.
Its quite trivial to set a property for both orientations
property int buttonH: b_orientation ? 50 : 60
This for example will make the property button height change based on the orientation. Is there some other qml issues you are having defining the style?
-golgoj4
trust me, stylesheets become problematic!