Ron Brese offers a version of Holtey's S11 small smoother as a kit. He provides a complete steel shell (precisely machined), and you add the infill.
This is a work in progress of my construction of the infill. It should have been a very simple task, however a custom modification of the bed angle meant that the design needed to be refined. This is the documentation of what I have done.
All observations and comments are welcomed.
Regards from Perth