The Fan housing is only held in place by the two bolts and spacers which go in to the heads at the top. the lower part of the cover just hangs in the air and to keep it from chafing on the cylinder fins they fit it with a piece of rubber hose split down one side. If you check you will probably find the other side with it's rubber still in place. personally I have overcome the problem by leaving the plastic nonsense under the bench in the workshop and fitted the fan in the "radiator " grille in the front of the bonnet where it can pull air through from below the car and cool the oil tank a bit as well.
Sounds like a good idea, do you have photos of that Mod?
