Reminds me of https://www.opensourceecology.org/, but way more low tech. One could actually try the Open Source Low Tech designs without having a small fortune to spare or gathering a considerable community to cooperate.
I've never really understood the point of open source ecology. As you noted, it seems egregiously complicated and expensive. I guess that's why it seems to languish in obscurity.
I thought of this guy as well. I love the spirit of attempting to make open source farm machinery. I think that domain and ones like it are under addressed by open source in general. I think the guy who started it still makes content on youtube but much of it seems to be recordings of zoom webinars he does. Not really sure what the state of the project is