Looks fantastic Petrov,
Really lovely to see the kit supplied lozenge on the model.
I am going to use the Aviattic lozenge on my build so it will make a good contrast to see models built with different interpretations of the night lozenge fabric.
Reference your silvering problem.
You may be able to tease off the existing serials by using decal softener or just plain water and a paintbrush?
The technique may be very slow, but I have managed to do this successfully in the past.
To prevent silvering of serials, I always apply them by using some wet future applied with a paintbrush on the area the decal has to be applied to. You have to be very careful though to carefully blot out the excess underneath otherwise you can end up with wrinkles in the overlying decal. Let it dry naturally, and there should be no silvering at all underneath.
If you need spare serials, drop me a message and you can have mine , as I won't be using the same decals for my kit.
Good luck and best wishes with the rest of the build!
Dave

PS- does anyone have any idea why there is a raised C- section ridge in the area above the fuel tank, on the lower centre section wing? I can see no purpose for this, and wondered whether there was supposed to be some other part for this area? Cannot see why.