A method for fabricating a composite truss structure having a core with a plurality of truss elements, comprising: preparing a dry fabric mold by a method comprising placing a first dry fabric layer on a tool having a non-corrugated surface, and placing a first layer of fabric-loaded mandrels on the first dry fabric layer to create a corrugated surface, each of the fabric-loaded mandrels including a dry fabric tube wrapped around a mandrel; wherein preparing the dry fabric mold further comprises placing a second layer of fabric-loaded mandrels on the first layer of fabric-loaded mandrels by positioning each of the fabric-loaded mandrels of the second layer in a respective one of grooves formed on the corrugated surface; wherein preparing the dry fabric mold further comprises placing a second dry fabric layer over the second layer of fabric-loaded mandrels; and, wherein preparing the dry fabric mold further comprises: placing one or more additional layers of fabric-loaded mandrels over the second layer of fabric-loaded mandrels; and placing a second dry fabric layer over one or more of the first, second, or additional layers of fabric-loaded mandrels; infusing the dry fabric mold with a resin; curing the resin to provide the composite truss structure; and wherein the method further comprises preparing each of the fabric-loaded mandrels by pulling the dry fabric tube over the mandrel or by braiding the dry fabric tube over the mandrel; and removing the mandrels from the composite truss structure after curing the resin to provide the composite truss structure. preparing a dry fabric mold by a method comprising placing a first dry fabric layer on a tool having a non-corrugated surface, and placing a first layer of fabric-loaded mandrels on the first dry fabric layer to create a corrugated surface, each of the fabric-loaded mandrels including a dry fabric tube wrapped around a mandrel; placing a first dry fabric layer on a tool having a non-corrugated surface, and placing a first layer of fabric-loaded mandrels on the first dry fabric layer to create a corrugated surface, each of the fabric-loaded mandrels including a dry fabric tube wrapped around a mandrel; wherein preparing the dry fabric mold further comprises placing a second layer of fabric-loaded mandrels on the first layer of fabric-loaded mandrels by positioning each of the fabric-loaded mandrels of the second layer in a respective one of grooves formed on the corrugated surface; wherein preparing the dry fabric mold further comprises placing a second dry fabric layer over the second layer of fabric-loaded mandrels; and, wherein preparing the dry fabric mold further comprises: placing one or more additional layers of fabric-loaded mandrels over the second layer of fabric-loaded mandrels; and placing a second dry fabric layer over one or more of the first, second, or additional layers of fabric-loaded mandrels; infusing the dry fabric mold with a resin; curing the resin to provide the composite truss structure; and wherein the method further comprises preparing each of the fabric-loaded mandrels by pulling the dry fabric tube over the mandrel or by braiding the dry fabric tube over the mandrel; and removing the mandrels from the composite truss structure after curing the resin to provide the composite truss structure.