You know, even though the engine design (the design of the one on the right; the greebling on the left one looks somewhat messy and unfinished) is solid and neat, it's actually a bit too solid for being called "skeleton".
Therefore, I'd recommend adding rather much greebling. The greebles on the left engine could be improved and organized, too, since - as I already said - I think they look rather messy.
As for the pod, even though it looks pretty good, I'd still suggest removing some of the heavy plating. After all, they cover nearly entirely the piece around which the pod is built, which is a pity in my opinion.
By the way, you might want to tinker the colours, too. The transparent cable, for instance, ought to be replaced with a black one, if only possible. It just doesn't look right.