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Big picture: ag is dominant land use on earth. Most of it feeds animals, not people. [1]

When talking of civilization design, we must start with agriculture design in terms of space use for resilient communities.

Average person spends minimum of $300 per month on food. [2]. Low housing estimate is [3]

Simple robust agriculture can provide:

Chicken-fish-rabbit combo with cows - but takes close to 1000 acres of 1000 acre EPCOT with 10k acre buffer. [4]. Venison - for 10 square miles, we have less than 1 lb per person per year. Fuggeddaboudit. [5]
Integrated into EPCOT - we should be able to do 1 acre per per person for full economy- 10000 acres for 10000 people - tapping 20% of the current available land of 5 acres per person in this world. But that is more like business as usual - with integrated design perhaps providing 1/10 acre per person. That is 40 kW solar (10kW average) - which should be sufficient for all use including industrial. If food were part of natural ecosystems. So based on solar income - the theoretical minimum must be around 10kW average energy production - or 1/10 acre.
- What is average global energy use in all forms per capita in kw/person ongoing average? It is actually only 2.5kw/person on average - so the 1/10 acre should be robust as a theoretical minimum land area per person. [6]
- Yes, and high wealth countries use 10x than the poorest - so if we 5x the world average - we still have about enough energy on 1/10 an acre. [7]
Solar income tapped via vertical cities - using solar steel and concrete - [8]

TLDR:

With 10k person EPCOT, we can theoretically optimize to an integrated design (a cool experiment) and use 10kW on average from PV. Ample natural space contains integrated agroecology.

Because of PV availability, we can robustify with 4x oversupply at 10kw/person average. This allows excess for storage and intermittency, given the sun shines 1/4 of the day.
Abundant energy can fuel autonomous settlements with zero marginal cost economic systems for full resilience and thriving.