One thing you are likely to find is that their is rarely a "standard" way of doing anything. Thats part of what makes all this both "art" and "fun" !!! Personally, I tend to use seperate cubes or latice objects for walls. Latice's are nice in that you don't need to use Booleans to make holes and you can have complete control over the surface shape, but the flipside is that they suck up memory and rendering calculation time. Unless the wall is very far away, I would avoid 2D squares or plains for walls, since any window openings will lack depth. (Note: All the walls in my GrandCorridor images are just Bryce cubes with procedural textures and boolean cutouts.) Hope this helps. Have fun!