Metals could be extracted from the lunar soil with similar processes than e.g. for aluminum extraction from bauxite.
Selecting an indigenous material for design work that ventures beyond the conceptual is
necessarily a somewhat subjective process. This is because of the obvious lack of direct experience and the difficulties asociated with duplicating the lunar environment on Earth.
Therefore, working experience with indigenous materials in a lunar environment is
non-existent. Theory, laboratory results and terrestrial experience must be extrapolated
to the Moon. Such extrapolation is a risky activity at best, fraught with potential for
overlooking a key factor or encountering the totally unexpected.