Had's McCulloch Chainsaw Shop -- Monster Models Triple J

[lajry]

Think those are cinder blocks not "center" blocks. Worked at Angeles Block in Fontana CA where those were made for walls & fences. They are used a lot for "sound" walls along freeways here in CA. Ended up being a sawman there cutting them in half to be put on the end of a line blocks since the rows are staggered like on your model.