So, given that the nice, tiny nailing is still there but not visible under paint coat, unfortunately I took a drastic decision, I cleaned the fuselage back to plastic/primer.
Why that?
Honestly I didn't liked to much the grey livery, but it was one of the few options available while using those nails, but the nails are gone, so I will apply a different colour scheme, this one
That, according to the doc I red, was very likely in natural wood, not in grey...
Next step a new tiny coat of primer, then a coat of Tamiya XF-59 desert yellow followed by oil paints-
A bit challenging but intriguing, so I will try and see what happens.
Alberto