Well Ken, it wasn't the Bugatti - I tend to favor the Aston Martin in the rain...
Needless to say they don't have the tank in my local salvage yards but I did find one up in North Hollywood...
Strick, I think you're right about patching inside and out but the endoscope has something brown on the lens clouding my image of the internal perimeter... not confident I have a good rough edge...I'll get a better view tomorrow