Is there any specific reason why the top "wall" has to have glass on it? I wouldn't think it would any effect on the door or the golem spawning. Can you not build a full up wall there?
Technically, is correct; the top wall doesn't matter. But its added to prevent hostile mobs from spawning up there, falling in, then jamming up the filters. Not the most necessary thing, but still beneficial enough that I figured it should be included.
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