Had a look at the wheel cover I was given by a local builder. It was a reject part that he didn't want to use, and I can't use it either. Its shape is a bit wrong, it is far too heavy, and has enormous, thick, windows liberally speckled with micro, but intend to use it as a mould. Used plaster joint finish to midgetize the windows, which I will bond on from the interior after finishing.
Pondered how to get the mould out of the finished product. Hmmmmm. Cut it in half lengthwise maybe. Don't think I can do much more untill I have a nose.