If these people want to know the “History of Import Cars” they are more serious than the average grease monkey. They probably would drive pristine cars - new or old - and a dirty wall and a peg board doesn’t seem like it would interest them. Seems to me they would want a garage with a mopped and buffed floor. Stainless steel workbench. Shiney red toll box with exceptionaly clean tools.
Does that make sense?