started with the decals
as assumed, the white areas of the roundels are a bit translucent and you can see the red stripe shine through
therefore first applied a roundel from a Hi-Decal sheet and then onto it as second layer the Siam Scale roundel

2 attached images. Click to enlarge.

Nice solution, Reinhard @grimreaper

Clever thinking, Reinhard!

Nice decaling job so far, my friend @grimreaper! The stencils do add to the looks a lot!

still not done with the decals but almost

3 attached images. Click to enlarge.

Looking great so far, my friend @grimreaper! A lot of stencils!

applied a subtle oilpaint wash

1 attached image. Click to enlarge.

Wash was very efficient, my friend @grimreaper!