real estate?
Your projection seems naive. You assume that you will have no unforeseen costs, no expenses for kids and family, that your renters will pay their rent often enough to stay profitable, that the property will stay full, that you will be able to continue to live that frugally year after year, etc.
And where exactly are you coming up with this extra dough you are putting into McDonald's 401k match?
And who exactly is going to do owner financed sales of real estate to someone with no money in the bank working at McDonalds?