Help finding Cobble farm

I am looking for the design for a cobble farm that was used in this video: https://www.youtube.com/watch?v=RsPIXLUyaqs&t=571s

It is about the 7:30 mark.

It is credited to Marten Da Mink, but I am looking for a schematic or something to help me build it. I couldn't find it on the TMC Discord, but that might be a me problem.