The champane drums are stainless and make the best.  The cutting down
of the drums will give you the rings and brackets for the inside.  The height
of the frame plus 4 inches is the useable part of the drum.  The cut off part
is where you get the inside parts.  The center rod  at the top is connected
to a Snaper mower drive disc.  The snapper mower uses a drive rubber wheel
that can be moved to increase the speed.
       I didn't build it but saw two used years ago.  One was for dark frames
and the second was for light honey frames.
       Michael Housel       Orlandobee