.: Quote from @Erik Estrada: They are technically more expensive than a traditional 30 year fixed. 

All my properties are traditionally financed with 20-30% down on 15-25 year AMs that balloon between 5-10 years.

And the cheapest capital comes from traditional lenders, who will want good credit score and financial wherewithal from the borrower.  

Saying you want to eventually "get out of Section 8" is akin to saying you want to eventually "get out of renting to [insert a traditionally marginalized race/ethnicity/religion]"

I am trying to decide whether or not I should go through a traditional bank (JPM), a morgage broker, or try and find a credit union.

Rates are typically higher than a traditional cash out refinance, however at least you are not getting the full loan amount + you have the flexibility to draw/tap in the money whenever needed.

Is it possible to get a traditional loan on the 25% and owner finance the rest? 

Why not just get your license and sell real estate the traditional way?

It has Roth component and traditional built in.  

I imagine the home I can use a construction loan or my heloc again to complete and then get a traditional mortgage as that will be on its own lot, but the cabins will all be on a large lot containing the farm itself.