I'm not sure quite waht the process wll be in Blender, but in Max what you need to do is pretty simple.
Create a new plane, ideally in the proportions of your nameplate image.
Assign it a planar UV map, and apply the nameplate map.
Position it wherver you want on your main model (The detail0 submodel).
Attach it to the detail0 submodel - attach is the Max word, I'm not sure what the Blender one will be, but essentially it makes them the same submodel.
But if I were you, I'd do this later, once you've already applied your main detail0's textures. It shouldn't need to be a priority just yet.