So I've now attached the pylons and guns to the main body. Although I drilled deeply into the pylon and body the top gun kept pulling forward. Copious amounts of alraldite/superglue/filler was used until the join finally stopped cracking. A cradle will be essential for support.
I sprayed up with grey primer, then over-sprayed with white. Hopefully there is some fine shading going on between colours.
Next up will to apply paneling. Not sure how I'm going to do this, plenty of masks need to be cut plus variations of lighter greys. One option is to use the decal sheet from the Round 2 Surak shuttle kit. Definitely needs some thought.