Any CAD report or CAD drawing that incorporates a picture of the roof, draws the roof to best fit between the extents of the diagonal line input on the template on layer 999. Refer to the section of the manual dealing with defining CAD templates. The roof picture may be further constrained...
Tried just this sort of thing at school with a wordpad file left open on the screen. People just added stuff to it all day. Then the saboteurs entered and started paki-bashing a friend of mine so they took it off. Didn't work. ...