AFAIK, during early development they are using a different, simpler welding process, including more welds and thicker off-the-shelf steel plates to compensate s

AFAIK, during early development they are using a different, simpler welding process, including more welds and thicker off-the-shelf steel plates to compensate strength. The welding process probably isn't optimized or fully inspected and the weakest parts would expectedly be the welds.