So I finished the Williams. It was a complete rebuild using the instructions from Re-Brickable, essentially everything was modified and the end result looks really good. The proportions are so much better than the original Lego model.
The aftermarket stickers are the icing on the cake. They were a challenge to fit though because they were designed for the original Lego model with different dimensions. In particular the Camel writing on the logos on the front no longer fitted, so I've got British GP style sponsorship on the nose and normal sponsorship on the engine cover! A compromise I can live with.
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