Please don't post lousy Tejas pictures here, there is nothing to compare with them anyway.
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Can you see one screw is missing on the right side bottom corner?
These plates (it depends on the temperature or strength variables which kind of material is used) are riveted on the internal frame. There are a lot of extra rivets so sometimes a few get lose. They just drill them out and replace them with new ones. Doesn't matter much unless more then a few in line are missing. Nothing shocking.
Between the brakes you see an attachment area. Looks like the place to secure the plane when doing engine tests. It is the same area where the airbrakes are situated (so can hold tremendous pressure). This is the level I look at. Every purza. You can understand the design a lot better by just using some decent pictures. I am curious about the antenna... Anyone?