perfect, Walt !

I've spent hours on DeviantArt, looking for wooden giant stuff as reference for drawing the school zone ... and by simply picking a nice Disney fairy tales for *deline, my fairy has actually located the perfect reference: "three blind musketeer mice"

Wooden area - although mostly made of barrels, desaturated wooden floor compared to the walls, distant wall in shades of greyish blue, and irregular, round-shaped termination that offer stronger stability.

Ok, if you don't mind, I'll translate and exploit that later, as *deline has stopped sleeping and is now messing everything up in the room.