Its done! ...well, nearly. I think I might have to give the plasma a little more white highlighting, and the viewports aren't painted either - though I'm not sure what colour to do them (I'm thinking black at the minute - highlighted with Charadon Granite in order to keep the colour palette I've been using up to now).
The tanks hull is well on it's way too... But I'll save that for when I've finished the thing completely. I'm still waiting for the English summer to decide it wants to stop raining... I have spraying to do!