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Your path design is limitless, but the 'trough' you dig should be about 1/2 again as deep as your concrete chunks are thick and the floor of the trough should be as level as possible.
You are digging more than you might think to get it nice and deep enough. All the dirt on the right (and then some) came from the trough.
After the path is dug, you fill in with a level floor of sand laid in at a depth of about 3/4 of the average thickness of your chunks. This sand will allow you to level the path, provide very good drainage, and serve as the 'dry mortar' that holds all the chunks together.
I described the dimensions of the path to Action Sand and Gravel and they told me we needed 2 cubic yards. This was about $90 delivered and they tell me that it probably weighed about 7,000 lbs :0 (it was wet most of the time I was dealing with it).
We did not need quite that much. Get the square footage of your path, figure how deep you need the sand, and get your volume figure and then translate that into cubic yards. A path this size probably needed 1.5 yards. The thicker the concrete, the nicer the stability of the path, and the deeper your trough - which means the more sand you'll need.
Depending on how much moisture you get, you should avoid plastic or even cloth weed guards laid in the bottom of the trough if possible, as they will impair drainage.
