Very well done. The best part is that a modest 4% return on net worth/investments will yield about 100k a year which is a very good amount for most people.
$100k should be enough to live comfortably off of in the Midwest.
The Trinity study that the 4% rule comes from is based on having some assets left after 30 years, not the original principle being intact.
Trinity study: https://en.wikipedia.org/wiki/Trinity_study
The most expensive early retirement tax in the us is health insurance.
Similarly saving 15% for retirement is critical, but saving enough to cover inflation is just as important with an early retirement.