Yes, they do. The center block in there runs the length of the body, and mostly goes right up against the Masonite. It ties the top and bottom of the bass together, in an attempt to control feedback; making these DCs semi-hollow body basses. The only places where the block is not up against the top (that I can see without mirrors and stuff) are under the 2 front bridge screws. and under the pickups. No, I doubt the screws are the way they are to protect the Masonite. That's just a side effect. Above a certain diameter and length, that's just how this kind of wood screw is.