The red flag came earlier than the author indicated.
We have everything important figured out
No, you don’t.
You don’t have buy-in from, seemingly, anyone. You don’t have investment to pay for labor, meaning that no one except you and some other daydreamer have any faith in your idea.
Which puts your idea on par with my niece’s idea to have ice cream for breakfast, and her brother’s endorsement of it.
An idea being simple - even by the standard of someone without the ability to assess its simplicity - still doesn’t make it a good one.