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From what I've seen I think you build it up like a normal brick wall, with mortar between the blocks and the foundation, then fill the voids with concrete afterwards to give it extra strength and heft.
Polygon-
That again pushes it to the levels of skill that I'd not be comfortable to do myself. At least not having the confidence to look anywhere half decent. I'll try taking some photos of other solutions along the brook so you can see my competition. And I use that term very loosely, some of it is shocking, but clearly hasn't fallen in, yet.
stevo_com
I think it's going to depend on my level of ability. I'm fairly confident I could do the posts and boards myself. Never poured concrete or set a block wall like you describe. It would be good to know more about it. How do the blocks key into the concrete foundation? Or does the wet concrete you fill them with mean they just "stick"? It would be about 18' long by 2' tall, for reference (if that wasn't obvious from the screenshot).