Sh*t that's bad luck mate! Which decals do you need? I might have some of them that would help, but not the nose-art of course. For that, you'd be better off drawing it in drafting inks, onto white or clear decal sheet.
I know it's a bit late now, but it might help for future builds: ANY metallic surface, clear-coated or not, is a pain for reacting with masking tape and 'solid' colours. I normally paint any solid colours first, such as the anti-glare panel, and mask that before brushing or spraying the 'silver'. Apart from anything else, it also prevents any metallic pigments migrating into the 'solid' colour's base, giving a speckle effect.
I hope you can save it, (it doesn't look too bad) as you've done a good job so far, and must feel gutted. Give me a shout re the decals, and I'll see what I've got in the decals files.
Terry.