Thank you all again!
For now some first shots of paint. This time I used the much phraised Drooling Bulldog paints for the first time. And in my opinion they deserve every phraise they get. They spray perfectly in multiple thin layers to build up an interesting coat of paint. At first I sprayed the white fields for the underside crosses and played a little around with stripey spraying...

metal parts get their Alclad II polished aluminium paint over a glossy black

thats "blaßblauer" for the undersides (which should be labelled "blassblau", but the color itself is fine

):
shading the ribs with Gunze's smoke:

and toning down the effect a bit:

Drooling Bulldog - Highly recommended! I can't wait to try out the other tones on the upper sides of the wings. But first I have to care for the rib tapes there...
Thank you!
Borsos