Oh boy , just looked at all pics and those cracks would send me looking for a donor car. Those bends from where the cracks propagate are so unusual, like someone tried to jump something or drove it off a lift too soon. But it makes it look, to me, like the frame has been flexing along that fold in the box section since it got bent. And Triumph frames do unfortunately like to flex and crack. And regarding safety, just a few weeks back saw the updated NHSTA statistics on teenage accidents and the winners are still 16 y.o. males in both numbers and fatalities. Then, like clockwork, days later in the township south of us, a 16 year old fatality with two injured friends. He had just gotten his new pickup for his birthday. Passing against the yellow, and on a hill, and not belted in (sigh). So for the next year while trying to piece that thing together, get him a boat. Where's a '55/'56 Buick/Olds when you need one?