The best / easiest mob farm design at this point is probably the one described in this video: https://www.youtube.com/watch?v=mn0lfHusR9o
Will update this when we build one in 2024 GotG run
https://docs.google.com/document/d/1w0fgSgTXRmPE7xyZfBu0Gdd7UunogYrlMjbOM1z6b9w/edit