This is what I'd like to do as well.
Problem is the financials. I can't find a bank to give a mortgage loan and renovation loan all wrapped into one package.
Unless you have liquid cash to buy the houses & material to fix them up, or a few properties to put up for collateral to borrow money from the banks, its not gonna happen.
After the crash in 2008, banks will not loan anyone money that can't secure the loan, & even then its tough.
Amazing how the banks were handing out loans like candy on Halloween before 2008, & after that, its a miracle to receive a loan.