Opposite Hand Mirrored Assembly. How to vary?

Hi Guys

I have an asymmetric frame so I created an opposite hand version.

I would like to present a few options (with different features) on the front and the back.  Think a fancy and a simple face.

Is there a way to create variations by editing the master frame and then copying and freezing / locking the mirror components.  I guess I could always save a dumb assembly.

I'm too scared to mess about with configurations - something I've not done with mirrored parts.  But can you do this successfully?

Hope my question makes sense.

SolidworksModeling And Assemblies