It was and is already being done "mate".
No.1 Bushmen have been surviving in Namibia and Botswana of 100's/1000's of years.
No.2. Many areas is semi desert on top with little rain but has big underground water. Boreholes supply 10 Cubic to 80 cubic meter per hour on many farms already for 70 years.
No.3 Tons of planes game roam there for ages....and the meat is excellent...unless you are vegan of course.
No.4 Colonial farmers have been farming in the area for ages already so the how to is known.
No.5 Solar power is every efficient there and winters are not to harsh with no snow. 100% Farmers use wind and solar to pump water and also to power homes...
No.6 The math works in such that at around $600k you can get off to the races with 2000 HA land, 510 sheep, 2 pick-ups/utes, and a 15 Kw of additional solar power if and when needed. This should return a min of (500 slaughter lambs) worth $55k of production. Where the cost of living is way more affordable. ( the milk cows is not forgotten either) $=US$
No.7 Most of the european descended farmers are very helpful with a great community atmosphere. Neighbors help one another....and new neighbors are always welcome...as long as you leave your leave your wallaby arrogance at home. They are also mostly high in Christian values. These farmers are also legendary when it comes to shooting a bolt action rifle.... culling game up to 250 yards with head shots with their trusty 243/6mm calibers..
No.8 I dont say 1000 people should not or cant pull together.... but its advisable to start with around 10. Even 1 is possible but that means more time and money is needed. The very type of thing that not to many people can afford.
One thing is for sure however, you like to shoot of the hip, and have never visited Namibia or Botswana.
As a type of prepper I also dont waste my time on anything Hollywood, GOD forbid, but seeing you are an expert on Hollywood I will leave you at it.
If you want to make this a "pissing" contest about my math abilities I am a good sport and up for it.... so lets go go go!
What is your prepped resources to date, mate?
And the BIG one, can you make "biltong"?
Yours prepping.
I think you better take some more "Math" classes nam, Aside from point 2, that list is completely out of the ballpark.
Harsh environments better? Like places with lousy soil and limited water, I don't think so.
Minimum of ten people? One is more than enough if you live in the right location.
The budget has no qualifiers so we can dismiss that, although I agree, having lots of money now is a good thing
Basically what you are advocating is the "Firebase Gloria" setup where a dozen or more people go out in the boonies and get ready for the zombie hoards. This is pure Hollywood, pure military mindset thinking. Any study of history will show that these Encampments ultimately get targeted and destroyed. Their main drawback is their isolation from other people and sustainable supplies.
I believe you should be surrounded by at least 1000 people, in a small regional town. You can live in the town or just outside on acreage but you have the protection of a large group of like minded people with common interests.