These are really basic error's by the author and really easy to fix, so there is no excuse for it.
On small jets like this and even the F-35, the texture mapping can take the whole wing as one part and give excellent quality to the repaint. An upper surface and lower surface and sometimes wing tip outer surface.
The NBAI Hawk texture below shows what I'm talking about. The wing and all control surfaces are mapped as one part and then separated for the animation of flaps and landing gear doors. This ensures that the mapping is spot on when all the parts meet together.
The only time that you would separate wing sides, flaps, landing gear doors is if the model is of a large aircraft that requires larger, more detailed texture to be applied to those surfaces but even then, it is not difficult to align those separated parts within half a pixel if not perfect, without batting an eye lid.
Even my Airbus A332 MRTT was textured as a solid wing and then all the flaps, and spoilers cut out afterwood.
Very poor workmanship for a payware model and very sad to see that something like that is being sold in the first place. Long live freeware models.
