That floor-to-ceiling tube should be straight; no res. It also need to be black to contrast with the red mobotray. If you paint the inside of the case red it will make the wall all red, and if the midplate is black, i feel it would be more uniform and sleek. That way the only thing breaking up the mobotray and case side would be the fact that it's two different panels. Think of it like armor plating. It adds subtle texture to the wall.