Hi Walfisch fans,
some progress but it is a case of two steps forward, one step back.
I've started the adding the decals to the wings after having masked and painted all the rib-tapes (Tamiya Flat Earth - possibly too strong?) and glossed the surfaces. The underside wing crosses (112 x2) went on very well apart from snagging the raised 'pimple' under the inner bar. I really don't like putting decals over these things - see more later. If I did this again I'd remove it then replace after the decal was applied.

Then the upper wing crosses (1-4)...........
I tried the starboard wing first but I could see straight away there were going to be problems because of the complex and quite severe curvature of the outer wing. Here were several creases and folds that I couldn't eliminate, even by making a few cuts in the decal. I used some Micro Sol as well but as it dried it was not going to go well ( or so I guessed) - there were two raised pimples again that do not help the decal settle well. I gave up and, rather than risk the horror of scraping a dried decal off, I removed it while still slightly wet. Also I had realised that it was pointless to have painted the aileron hinges and plate yellow as they would be largely covered by the black cross!
So, I cut off the two round pimples but drilled a slight depression in each so that I could locate them and replace them after the decal had been attached. Masked off and painted the white panel, glossed, ready to go. As for decals I now had an untouched port wing cross/panel (1,2) and starboard aileron decal (4). The black cross areas were cut out using a scalpel and some very good decal scissors (from Micromark). For the starboard main cross I used 52 from the 'C' option as it was same size and shape.
This may all be my inexperience with large decals and this type of subject and perhaps I should have had faith that the WNW decal would have settled down perfectly.
Fuselage almost ready for decals apart from painting the cockpit leather coaming. In the end, my finish of the yellow-beige was p..s-poor due to an overly thick and dusty 'orange peel' coat of the Humbrol enamels so I had to gently sand it back in places and re-coat. This meant that my pre-shading almost disappeared but I've now emphasied (or tried to) the linen areas by using the oil-dot method. White, yellow (very tiny amounts) and grey-brown dots were applied then I've streaked them gently in an oblique fashion. Not too bad, but this is going to be a 2-foot model (not to be studied at distances less than this).

This is all glossed since taking the photo and next time I hope that everything will be 'decal-ed', wings attached to fuselage and ready for rigging.
Phew!
Cheers,
GrahamB