I have an object I need to be hollow, so I extruded the faces a little bit. The object was water tight to begin with and checked out as valid when running Verify Poly Mesh tool, but after extruding, I'm getting the following error:

// meshverify command executed //
// kMesh //
// (1116 vertices) (2264 edges) (1152 polygons) (0 polygon holes) //
// length of points (vertices) array 1116 //
// Stats: v=1116 (1116 unique) f=1152 (1152 loops) e=2264 (2264 unique) //
// self-intersection test 100% complete //
// Error: MESH: SELF-INTERSECT: island with inward face normals intersects another island //
// meshverify ran on 1 mesh //
// Warning: line 1: DMM: Selected mesh(es) NOT suitable for DMM use, see Script Editor for details //

but I'm not seeing any overlap. fuselage.zip

I would really appreciate any help here. Thank you,

-ctj