Owner financed homes are very rare these days but they do exist. Be careful that even if you do everything right on your end that the seller doesn't default and still have the home foreclosed on!
You will want to work with a mortgage company (if you haven't already) to learn EXACTLY what you have to do to qualify down the road so that you are assured you will in fact qualify when you need to (provided mortgage rules don't change between now and then).
Sometimes you can deal with a "portfolio" lender or a "hard money" lender that can still do financing although at a higher interest rate.
I have several friends that Realtor's in that area that would be glad assist if you like.
Best of luck!