What are you anchoring? The mold so it doesn't move when you cast?
 
Mostly thinking about the lateral forces that may arise from, for example, wind or something else on the outer corners, see image. So that it doesn't end up like Bambi's legs on ice :). Or is it "impossible" for that to happen? Otherwise, maybe you should cast something similar to a plinth in the corners, see image as mentioned. Illustration of a red building with arrows pointing to outer corners, indicating potential force impact areas from wind.
 
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