Hi,
At shorz, we have more than enough experience in machine designs, enough to provide the adequate and functional solution you are looking for.
After reading through your project which we found interesting, mechanical engineers at shorz understood what you need, which is just a reduction gear box which would drop the weight at a rate of 1meter/min. Our solution would contain calculations of the required gears in the gear box, a sketch of the arrangement of the gears and a cad file (Inventor or Solidworks, your preference) to show 3D of the gear box.
It is good that you have given all the necessary details, but one thing is left for your project to kick off, which is a go ahead from you, awarding us this project and have it done in no time.
Message us via chat so we can go into details.
Thanks.