I've noticed that on the vertical wing you've used the same mounting as the Lambda, down to the exact shape. You have to be careful when doing that, because the human eye will use that as a scaling clue. As a result, things like that can make it look a little off, as if it should be bigger or smaller than it is. I think it'd be better if it was the same style, but a slightly different shape.
I've found a good trick when dealing with similar greebles with different scales is to reduce the count of of a repeating objects for a smaller version, or a higher count for a larger one. In this case, to keep the sense of scale right, you could remove one of the ribs from the side.