That again depends on how much contrast you are using and you need to exaggerate somewhat in order to compensate for scale. On engines with bump/normalmapping this is obviously a non-issue but since that sort of thing is too expensive for TK to add we have to make use of traditional old-school techniques. If you don't add some kind of depth to the panellines it will make the texture come across as flat and dull-looking, not to mention the seams will not look like seams. Take a look at a really well-built plastic model and you'll see exactly what I'm talking about. Professional modelers would NEVER go to the troubles of multiple layers of preshading, washes and weathering if it didn't benefit the estaethics of the finished work in some way. We're dealing with models in a model world here, and not real aircraft.