Dumb waiter update

I think I know how to make my super-slick dumb waiter work. The new idea is this: Picture an elevator. A normal one has one shaft in which one capsule goes up and down. That's fine as far as it goes. Mine is a little different. My elevator has two shafts, running side by side. They connect at the top and bottom. Also, instead of having one set of cables, mine still only has one set, but it goes in a loop. So, the two elevator shafts (or dumb waiter shafts, if you prefer) share one cable. There's a pulley system at the top and a pulley system at the bottom. Multiple little capsules are attached to the cable. Here's where it gets cool: the capsules are only attached at one point (think of a ski lift) so that they have their orientation controlled by gravity. That way (like a ski lift) I can have multiple capsules going around the double-shaft-elevator-loop-cable-thing (and yes, that is the technical term for it). The result: a dumb waiter that can have multiple courses loaded into at once in the kitchen, each of which can be retrieved individually upstairs. Success! Now I just need to sort out the little details. For example: how will I actually build it? And where?