When placing a facade, click and HOLD DOWN the mouse button. This allows you to drag it where it’s needed. When lining up facades, it’s the only way to do it. NOTE: You can still scroll the screen when dragging around a facade.
Sometimes directions like left, right, upper, lower are easier to understand when viewing the facades in the top-down view.
Click on picture in Isometric View column to see a larger version (often a *much* larger version).
Base Terrain indicates what sound will be played when a player walks over a facade (assuming it can be walked on). In some cases they are listed with a question mark (dirt?), because this was the terrain that showed up when the facade was deleted, but doesn’t seem to make sense in terms of the correct sound to be played.
In all cases… I’ve never viewed these facades in Arcanum to see what happens.
Feedback from you, the Arcanum mod community is not only welcome… it’s pratically required: firstname.lastname@example.org