Thanks my friend @johnb!
Indeed, brush painting it is!
One of the interesting points of the Tornados, modeling wise, is the fact that one can observe many small but noticeable variations in coloring of specific areas, not only through the years, but also in different aircraft of the same period. Such an area is the broad area at the fin base, which features some seemingly bare metal areas, possibly heat resistant to the thrust reverse flow. some of them were partially or completely over painted with camo color. It was interesting to see the "Mig Eater" with some of them over-painted, some time well after the Gulf War, freshly (re)painted. Luckily, I found a 1991 pic at the net, which shows clearly the unpainted areas:
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1. Image attribution: Air-Britain Photographic Images Collection
2. Bare metal
3. And here
4. And here
Some modification has to be done at my already painted area at the fin base: seems there's no curvature, but a rectangle instead.
Modeling is such an amazing hobby: the more you research, the more you learn...
