Sorry for the tardy response CB. The image on the left is a symbol of the false ceiling that I saved to the User Library. I made the shapes out of p-solids and solid subtraction (or maybe it was Hole in Polyline Solid). Once you have the shape you want take a 3D view with only   the shape in it (nothing else). Then from the "Tools" drop down menu select "Symbol" and then "Convert to Symbol". Once you have the Symbol you can resize it to fit any shape room by dragging the edit handles. Tha