3D via surfaces?

[adam_bise]

Just wondering if it were possible to make 3D systems, like a multi level warehouse using more surfaces.

So an area is designated somehow as 3D and one or more extra surfaces are created the same size as the ground area.

Would it be possible to "pass" items directly between these surfaces? With say, a vertical "belt"?

Let me know if this is just ridiculous lol

[wobbycarly]

Sounds somewhat like the Factorissimo mod.