Groovy! I like where you're going with this. Something I would do if I were making this: on the hull plating lines, give the impression that there is depth there. A darker stripe down the center of each line, and a blur. That will show that there is a curve down to the center of the line, fooling the eye into thinking there is depth where there actually is none.
EDIT: Also, a subtle but perceptible set of "plate" backgrounds would do nicely. Something that would sit underneath the more visible aspects and give them depth. Then, when you do speculars, you can "raise" certain areas by making them a bit brighter or duller than their surrounding "plates".