sheets of the side panels. The thicker than normal bullet proof windows and even the weld points where he attached armoured plates and made modification as he built it.
Not everything is as it would be in reality however and he seems to have to direct his focus to certain things to get the full detail. The radio is usually playing in the background while he works but can only hear it when he actively listens for it. As he focuses, he can hear it is playing a track by Pearl Jam and he begins to quietly sing along, half consciously humming some of the words.
As it comes to the chorus he stops to sing along with more focus:
♫And now my bitter hands cradle broken glass
Of what was everything? ♫