Each window edge should be attachable and sealable.
Not Enough Votes
"Window Triangle Slanted Inverted", "Window Triangle Slanted Large Inverted", "Window Triangle Side" and "Window Triangle Side Large" all have a diagonal edge that's not attachable.
The Slanted Inverted variants could make the third side like the other two. Flat with the grid surface that's parallel with the edge.
With the limitations of a grid system, I don't know what I would even use the Window Sides for. If they were diagonally-half with armor/wall I could see a use for them. If they attached on the sides, they'd be usable, but I can't think of where I'd want to use them since they would never be flat with the grid around them.
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