Time for an update on this.
Could say I got sidetracked with a couple of other projects - which would partially true but did fit them in while paint, etc, was drying so did not loose a lot of time on the Flea!
OK so this is what I have been up to
This is the second stage of painting, first stage was to undercoat in flat black did not photograph this as there is not a lot to see
Second stage was to spray with a basic rust color - and yes I am playing with the beauty of an airbrush , as I sprayed at a constant angle - roughly 45 degrees so that I left areas either not touched or only lightly sprayed so that the undercoat of black was still evident.
Hopefully you can still see the shadows created by this process ........ definitely need to improve my photo set-up.
Next was to spray on in random patterns an increasingly lighter number of shades brown, to orange/brown, orange and finishing with lighter touches of yellow.
Again tried to leave some of the shadows untouched , would like to say the splatter effect was planned but the truth is I an still learning in getting the paint viscosity right and I got it wrong here, but it worked
The next stages I forgot to photograph
but are fully covered in http://forum.gn15.info/viewtopic.php?t=5476
which cover the stages of sponging on a variety of colours then hairspray and addition of salt,etc.
After that and while the salt was still attached to model I sprayed a a base coat of green , followed again by lighter shades along edges top of model etc ( its a very simple version of the colour modulation technique used by the military modelling guys). Again sprayed a a fairly constant angle and still trying to leave areas in shadow with the flat black undercoat still showing thru'.
So now I am at this stage, I have removed most of the salt crystal by brushing them off, some of the smaller pieces will need to be removed by toothpick etc.
There are always bit of a model you end up really liking and bits you don't
But in this case I really love the effect I have got on the roof, just need to try and keep this during the next bits.
No more photo's, next stages will be put in some scratches and polished wear also increase some of the shadows around bolts, rivets etc and then give bottom of the Flea some light dusting of dirt,etc.