The bracing inside of the liner should be used as a visual tool to aid in alignment (think of aligning the crosshairs of a scope) when setting the piece into position. When welding one piece to another piece, for alignment, use the longitudinal weld seams in the haunches, where the bottom half is welded to the top half. There is also a mark at 12:00 and 6:00 center on each piece to aid in alignment.