Abstract: A lightweight composite structure including a continuous filament member laced through the structure to provide a plurality of tension members integral with the structure. The preferred method of manufacture is to layup and cure two or more composite structural members, such as "I" beams, with each cured "I" beam having a plurality of holes extended through its upstanding leg, its top and bottom T-cap portions. Next, an uncured composite skin panel is laced to the top T-cap portion of the "I" beams, utilizing the holes provided through the upstanding legs of the "I" beams. The laced composite structure is then cured using pressures and temperatures well known to those skilled in the art.