My scuttle is very flexible and it was about an inch too wide, so I drilled the holes for one side of the scuttle, fitted the rivnuts into the chassis, bolted it down and then flexed the other side of the scuttle into the correct place. I am tempted to in the future remake everything out of carbon fibre but that will be a long way off.
I've now finished the rear aluminium panel and safe to say it was a bit of a ball ache, I am not a fan of creating panels I have to say, but it's done now and I'm reasonably satisfied with it, here is a picture:
It will be vinyl wrapped like the rest of the body panels. I think I have also decided I will be vinyl wrapping my carbon aeroscreen with dinoc carbon vinyl as it looks a bit crap due to the large amount of resin at the bottom of the screen with a number of airbubbles/disturbed fibre strands, it only cost £5 and will look reasonable once wrapped.