Managing UI for vertical mode and horizontal mode

I'm managing UI elements with prefabs to avoid modifying scene information which makes me crazy...
It works well so far with 4.6 unity UI system

Now, I'm thinking of managing UI for vertical mode and horizontal mode..

maybe all the things I should do is resetting RectTransform of the objects which have differenct position, size or anchor on each mode.
but transform of Component class, is for just read, not for modify..

Is it possible...
make UI prefabs for each orientation, and initialize the UI gameobject with the prefabs without destroying it?? ,, Can I?

or Replacing only data of RectTransform, not replacing the whole instance... (not removecomponent and addcomponent)..

hmm.. Is there any nice idea?? please give me wisdoms~!

 

You can set the anchormin and max positions of a button component for example and then you can set the position relative to those.

 

I would like to make specific layout for each mode.. new anchor min, max, pivot ... and position.
And want to make it easy..

 

Can't you simply check the orientation of the device (assuming mobile) and execute the correct canvas/panel based on that?

In my experience a layout that works in landscape may not always work very well in portrait or on a phone as opposed to a tablet. The correct solution in such a case is to have seperate layouts for each mode.