Hi Lionel
Is this the one you are thinking of ?
Little more information on my web page
http://canadianmilitarypattern.com/Tools.html
If so this is the lift I built for my barn back in 2003. Based on electric hoist, with barn door track for the guide rails, 2x2inch box tubing frame.
Makes moving things up and down stairs to the loft of the barn much easier and make the loft really usable for active projects. Will lift 1200LBS easily platform big enough for one of my engine test stands with engine.
One of its more more day to day uses though is as a adjustable work bench in the shop, great for getting stuff to right height for working comfortably. Great for small parts like whole CMP axle assemblies.
It has a insulated shaft cover that is picked up as the lift cage reaches the loft. Covers the hole so you don't fall through and keeps the heat in the shop during the winter.
If anybody has questions ask away.
Cheers Phil