I had to test fit my exhaust to get an idea of where the valance needed to be. It'll need to come back off tomorrow. I started out with a piece of 6mm ply which I sealed and bonded with fibre glass paste and screwed temporarily in place to hold the weight. A couple more skims of glass paste and a good rub down.

It was then time for a couple of light skims of filler.

Tomorrow the exhaust will come off and i'll need to scribe my finished bottom edge, only then will I be able to decide wether I like it or not. I do have a spare if I don't. Should end up quite subtle.