I have created a simplified airframe structure consisting of a circular tube, stringers (10 simple flat sheets that run the length of the tube on its inside), and 15 transverse disks repeated down the length of the tube on its inside.  The stringers were made with the circular pattern tool and the disks were made with the linear pattern tool.  They do overlap if that makes any difference. I deleted all patterns and extrusions that it told me caused the mesh to fail one by one and eventually I was down to the original tube and it said that the simple tube section failed to mesh.  This is rediculous, please help.