Are you going to put any detail into the top-most structure connecting the nacelles? Some vents or some beveling maybe?
No. No more detail. it has some bevels but it's not meant to be seen in great detail.
I finished the textures for the engine cowl and just need to add a few final touches to the wing textures.
I also started the textures for the side. Still need to add a few things to finish it up. The colored strip will be different depending on the role the shuttle will fill.
I also finished the textures for the back of the shuttle.