Thanks everyone and, Terry, thanks for the tip on those decals. I will take that under advisement but I'm happy to report that the decals went onto the model nicely I think.
After coating the home made decals with a sealer and allowing them to cure overnight, I applied them this morning. The following two pics show the finished sides of the fuselage including the applied WNr and 9K+MN codes, plus the stencils which I had also applied. My original plan with the Red M's was to leave a bit of the black backgound and blend it into the eventual black overspray however I decided to carefully cut the black away and go with the pure white outlines. My reasoning was that the field applied black would possibly have been sprayed around the codes, although there are pictures to suggest the possibility that the codes were repainted after the black was applied. The look I am going for, however, is a rather patchy, haphazard, application of the black on the fuselage sides and tail fin so the clean black/white demarcation of the M's would have looked out of place. At any rate, a new #11 blade made quick work of this and they came out nicely I think, the only issue being that the red is not quite uniform altough this effect may diminish with a final flat coat.
The colours of the WNr decals came out beatifully but the downside is that these decals are quite thick and you can see the cut line quite distinctly. This is a bit of a disappointment as, otherwise, I think they turned out great. I plan to build up the area around the decals with successive coats of brushed-on Future to feather the edge, however, the other point is that there will, again, be a black overspray applied around the number and this will help to hide the cut line. Note also that these numbers are intentionally installed on an angle, as most pics of 410's show that the WNr stencils were applied parallel to the ground when the aircraft was parked.
The next pic shows the extensive stenciling on the wings. These decals took a couple of hours to do as I trimmed the excess film off the walk line decals and applied these with a bit of Future to help them set without air pockets. Each line is individual, hence the amount of time needed.
The final two pics are overall shots of how the model looks at the moment. I may get to the black overpray later today.
Thanks again for looking in.