Make certain wall objects visible with walls down?

I want to do simple overrides for some of the objects that snap to the walls in game. Normally when the walls are down most wall objects are invisible; I want to make some shelves and wall decorations visible even when the walls are down. I've made a couple tuning override mods before; I figured this would be similar, but I can't quite figure this one out. 


I checked the tutorials index, but there doesn't seem to be anything on this (unless I just managed to over-look it). Can someone please help me figure it out, or at least point me in the right direction? 

I'm using 3.1.2.2(wishes) if that helps. Thank you.