I decided to just finish the wings, the metallic particles are so small I can't see them being painted separately from the body making any difference. I put on some wetter coats of the cellulose metallic and finished off with 3 coats of 1K acrylic clear.
For information, I used a cheapo spray gun for the etch and primer coats, then an Iwata AZ3 HTE2 spray gun with a 1.3mm tip for the colour and clear coats. This was all running from my 3hp 150l compressor that I made up a short copper section with water drain. It has actually given a really nice finish out of the gun with not a single run! A couple of small bits of dirt got in one wing but should easily polish out when it has fully cured. I had to paint the wings in two lots under my workshop porch bit as it was threatening to rain...