I just made a pelvis with news paper and began shaping it, molding the structure around my own hip width (taking into account that although my skeleton is male, it will also be huge so my width shouldn't really be an issue structurally or anatomically). I just taped it onto the spine about a foot lower than the ribs and have constructed the thigh bone (femur) and two feet, along with having added shoulders and arms (with hands) to the skeleton.