About this 3D model

This is a creeper David made in FreeCAD. We meshed it in Gmsh because it appeared that the FreeCAD mesh was non manifold. There are two STL files. The first has a hollow head and body with 3mm walls. It stands 13cm tall and is scaled so the head is a 4cm cube. The second is from a solid without any cutouts. We ended up using this one and scaling it down to 9cm. We got the dimensions for the creeper from http://ata4.info/mcdim/