A fighter has no subobjects (except for LODs and debris), but sice you can't glue them, I reckon you have to put them in the hierarchy in trueview, right?
And UV projection is something I'm getting the hang of.
If just one face is crappy, the use Projection per face - select the face you wat to correct, then using the rotation button(for normal objects), rotate the orange plane(or box) a bit, and hit apply.
The plane will change . If you don't get it right the first time, rotate it again, but differently. (Normally a 90° turn does the trick).
And DON'T select multiple surfaces. You have to click on the mouse button to exit the UV projection, and then enter it again to select the second face, or else it keeps the first face selected!