Gingerbread Exchange Community

Bgreenwood - I moved your post to the "General" topic, hoping that maybe others would chime in as well. 

Yes, I have done both - covering walls in fondant (which I found very time consuming and only did once), and flooding walls with thinned Royal Icing.  Hands down, I would choose flooding walls over mixing/buying fondant, rolling fondant, applying RI as smooth as possible, then covering with fondant.  Way too tedious for me. 

Plus, flooding will naturally level off and provide a smooth wall in order to airbrush.  In my opinion.

A trick that I do to create sturdy walls, no matter how I am finishing the outside walls (leaving natural/gingerbread, flooding, candy/cracker covered, etc), I always, always, always frost the inside of large walls and roof sections (before building structure) with a thick layer of Royal Icing to provide me extra strength.  (see attached pictures)

Hope this helps!  I look forward to seeing pictures when completed.