Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer and modeler (from time to time and some projects I could make the functional prototype too).
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years experience working on various systems/devices across multiple industries, from concept to launch.
1 - from what i've seen in the attached files you need a railed lifting platform with capstan and sliding second platform
2 - from the beginning, your model has some flaws - the payload being lifted with a single cable is prone to spin alongside the cable axis and not fit through the lower holes
3 - the sliding platform need to sit under the main platform in order to be able extending to the required direction without disturbing the operator
4 - having the sliding platform to move left or right would be kinda challenging, and will require a very good and strong design
5 - for each station (level) will be necessary to have a safety stopper and also a falling down preventer (could be ratchet type, brakes, centrifugal clutch, etc)
6 - didn't figure out how the platforms will be driven, but i guess by electrical motors
7 - i will need some basic dimensions in order to start the design
8 - this is a conceptual design and not a ready for prototyping/manufacturing design. we could discuss about this (manufacturing) with negotiation on the price and time
Regards
Bogdan