However I brought it out again today and continued experimenting with it. My biggest problem is with the big flat "wings" as they're kind of hard to highlight. In the end I did it kind of slap-dash just to get a general idea of the final look.
I still didn't like it and had more or less settled on respraying and trying another configuration when I decided to try and use a grey wash on the brown areas. This worked pretty well, giving the miniature the more indistinct grey/brown colour that I'd wanted from the beginning. I'm still not entirely happy with it, but I've at least decided to postpone repainting. This is what it looks like at the moment:
The highlights and detailing are a bit hap hazardous, but you get the idea.
So, I'm kind of on the fence when it comes to this colour scheme and I'd love to hear any input or ideas about how it could be made better. Is it a scheme that can be salvaged or should I start again from scratch?
Oh, and it finally hit me why the Relthoza cruisers always have felt kind of familiar to me; they look very similar to the Minmataar Rupture cruiser from EVE online! Just look at this: