An elongate tubular structure comprising: a) a first tubular structure comprising: of 1) a first sheet metal having a machine direction and a width, said first sheet metal being continuously and convolutely wound about a first longitudinal axis forming a plurality of convolution layers, wherein the convolution layers are adhesively bonded using structural adhesives; and wherein said first tubular structure comprises a net structural density substantially less than the density of said first sheet metal ; and said first sheet metal having a tail portion; and, 2) wherein said tail portion of said first sheet metal is disposed upon and bonded by a structural adhesive to an immediately subjacent convolution of said first sheet metal along said width to form said first tubular structure ; b) a second tubular structure comprising: 1) a second sheet metal being convolutely wound about a second longitudinal axis, said second sheet metal having a tail portion; and, 2) wherein said tail portion of said second sheet metal is disposed upon and adhesively bonded using structural adhesive to an immediately subjacent convolution of said second sheet metal to form said second tubular structure ; and, e) wherein a first end of said first tubular structure is matingly and fasteningly engaged to a first end of said second tubular structure . a) a first tubular structure comprising: of 1) a first sheet metal having a machine direction and a width, said first sheet metal being continuously and convolutely wound about a first longitudinal axis forming a plurality of convolution layers, wherein the convolution layers are adhesively bonded using structural adhesives; and wherein said first tubular structure comprises a net structural density substantially less than the density of said first sheet metal ; and said first sheet metal having a tail portion; and, 2) wherein said tail portion of said first sheet metal is disposed upon and bonded by a structural adhesive to an immediately subjacent convolution of said first sheet metal along said width to form said first tubular structure ; 1) a first sheet metal having a machine direction and a width, said first sheet metal being continuously and convolutely wound about a first longitudinal axis forming a plurality of convolution layers, wherein the convolution layers are adhesively bonded using structural adhesives; and wherein said first tubular structure comprises a net structural density substantially less than the density of said first sheet metal ; and said first sheet metal having a tail portion; and, 2) wherein said tail portion of said first sheet metal is disposed upon and bonded by a structural adhesive to an immediately subjacent convolution of said first sheet metal along said width to form said first tubular structure ; b) a second tubular structure comprising: 1) a second sheet metal being convolutely wound about a second longitudinal axis, said second sheet metal having a tail portion; and, 2) wherein said tail portion of said second sheet metal is disposed upon and adhesively bonded using structural adhesive to an immediately subjacent convolution of said second sheet metal to form said second tubular structure ; and, 1) a second sheet metal being convolutely wound about a second longitudinal axis, said second sheet metal having a tail portion; and, 2) wherein said tail portion of said second sheet metal is disposed upon and adhesively bonded using structural adhesive to an immediately subjacent convolution of said second sheet metal to form said second tubular structure ; and, e) wherein a first end of said first tubular structure is matingly and fasteningly engaged to a first end of said second tubular structure . <EOS>