@Ryan Bono Sounds like you've built a sweet team and process!

Now it sounds like they have gone into ICU and we have to wait to hear from their estate attorney to find out who can sign, POA, or what the process is going to be going forward. 

Im doing it more for the love of learning the process and to make a side income.  

I would caution you with searching for lenders as those that don't follow a draw process or will lend on anything may not actually be a lender and trying to scam you.

Then you put another portion of your mortgage on the HELOC and repeat the process. 

Custom building a home is a slow and painful process.  

Are there any unique considerations or red flags you look for compared to the traditional rental process?

We would have preferred to work with them within reason to make it a quicker and easier process.

From there, you can research through zillow/redfin whatever but your best bet would be to find an investor/agent (I a one but based in Fort Lauderdale) who can guide you through the process.

You sound like the brave side of the coin in that you did due diligence and respected the process.