Not directly related to this build yet but I just spent a long time looking for this so figured I would post the links here for future reference.
That one has some information on Tone’s aluminum cooling “necklace”
Then the fan on the top of the hopper.
And this is what I was most interested in:
This fuzzy picture was a screenshot of the above video. If I’m not mistaken, this is a multipurpose chimney. It can vent off excess moisture and it looks like it might be the safety “POOF” lid.