My apology for the late response; my "source" is the vivid trip I experienced taking a 4g seeds syrian rue tea (and nothing else; the trip was also accompanied by strong nausea, though there are ways to mitigate that). That included vivid open-eyes visuals. Beyond that, I'm struggling to find reports on erowid that do not include other substances but I can tell you there are tens of similar reports on the DMT nexus.

Also, you talk about naturally occuring DMT, but be aware that there is absolutely no scientific proof that DMT is contained in any amount sufficient to provoke a trip in the human body, even with a MAOI; it's there, yes, but in minute amounts and almost certainly as a byproduct of the synthesis of something else. Maybe you're right on the other hormones, but if that's the case it's not due to the MAOI properties of harmals either, since we're not seeing people using pharmaceutical MAOIs tripping.