This was the cover of the brochure, note the crane, it probably lifted your Cheoy Lee at one time or another.   james...

Bill Sandifer, who owned this model when he lived in Singapore writes the following:

"...The boat had a unique propulsion system with a one cylinder Volvo diesel in the lazarette connected by pulleys and belts running through the seat lockers to a transfer case under the cockpit floor then to the shaft in the conventional position.  The transfer case was quite small and had no visible opening.  I wanted to maintain it so called Cheoy Lee to inquire about the device.  I was told they had no information as the man who had built the unit had died and there were no plans for it.  Interesting.  No one else know anything about it.  The unit continued to function during the time I owned the boat and may still be going strong for all I know.  The boat was severely under powered with the one cylinder Volvo.  If you got caught by the tide in Singapore Harbor and the wind died one had to anchor to await the tide change....