I went down the route of extending the arches with a polyurethane foam core/GRP DIY job. It was a
lot of work but I was pleased with the general result. Of course that was in 2007, and I
still haven't got around to finishing them and making the body all the same colour... Latest thinking is to go for an all over vinyl wrap. Watch this space. In the meantime, here are a few photos of the arches in case you're feeling you've got too much time on your hands!
Richard