I think we finally decided this must be a commercial concrete casting where they had forms, probably metal, to turn our a large number of the same size and shape in a specific patterns. Then they used several of the same molding turned different directions to stack the fountain. I have given up on chasing where the moldings might have been sold but I might guess it would have been some high end yard decor place and whether it is still available might simply depends on how many they made in the first run, before changing to a different pattern. Kind of like chunking out concrete blocks, if you've ever seen that?
I may eventually take a shot at turning the idea around and making it from cedar but right now the weather here is not making me want to go outside any more than totally required as it is topping out at 107 actual temp! the one saving grace when the temp goes that high is that the relative humidity may go down into the teens. Less sweat but more like an oven than a sauna!
My brother in Missouri has asked if we can even get water out of a hose at hose levels.
Can you see 2X6 cedar sidewalls for ease of building, treated 3/4 inch plywood bottom, with black plastic overlay to waterproof with the top edges of plastic trimmed with a wooden trim along the top of the sidewalls. Maybe a variety of plants in the spaces where they have the large river rock?
Problem is that I have all these pumps left over when I moved most of my tanks out and it seems a shame to just leave a good pump in the closet collecting dust!
How about a couple inches deeper water with a few crawfish, darters, and snails? If a guy wanted to get totally crazy, add a couple plants in the creek?