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I'm interested. Always looking to support the Pennsy effort. So if we're looking at the "narrow" version, I think it looks too narrow, even though the casting may be dimensionally correct. In the diagram it looks like there is at least half a brick at the narrowest point. I'd be interested in seeing the "wide" version. Excellent work!
It's not the mortar joints that I'm referring to; it's the overall width of the casting. Think about how the wall must support the soil coming up from the tributary. Even if at a forty-five degree slope from the creek bed, the casting is not wide enough.DFF