100 men can grow enough food for 10000 men only if they have modern infrastructure. If you are attempting to not be reliant on the government or on capitalism, how are you to get industrialization or infrastructure? the only realistic way i can think of (and the only way described in basically all theory) is seizing the means of production, which leads to issues with people having to relinquish power for the system to work. your ideas all seem like they would work for a small commune, but not on a large scale