When assembling Gundam models you first assemble the inner frame and then afterwards put on the armour. Here's the torso and the backpack sans coverings. Inside the torso is a little seated pilot but I don't have a picture of him.
And here is the rest of him, although I don't have the pelvis part included in the photo. Apparently, people who know what they are doing 'test-build' the entire kit to evaluate it before taking it apart and modifying, painting it. Myself, I am afraid I will break a joint or something so I elected not to fully assemble. I already know how it goes together as I have done a Zaku before.