I like this idea. However I have a question.

Wouldn't the eyelets cause friction and fray the rope?

As for those who worry about it self leveling.

Why not use one rope for each corner?

Then connecting them together you can pull one rope and up and down it goes without a problem AND SELF LEVELING.

Having done this before [using all pulleys and no eyelets] for a train table, I know it works.

Thanks for a swift reply to my question :)

Also thanks for this ible :)