"the dude" is correct, from google, the definition of weight is "the vertical force exerted by a mass as a result of gravity". The Caesar input asks for "rigid weight" and not rigid mass, so Newtons is correct in SI. However, looking at the "English units file" in Caesar, force is defined as lb, which to me is confusing, as mass should be in pounds (lb) and force should be in pounds-force (lbf). The definition/units should be made clearer in the Caesar English units file to prevent this confusion. Almost exclusively I work in SI units, so this confusion does not occur.
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Mike Kowal