I will use comp tools to appraise property value without the ADU to determine cost added by ADU.  

For estimating rehab costs, try using the BiggerPockets Rehab Estimator Tool or get quotes from contractors through sites like HomeAdvisor or Thumbtack.

Seller financing is just one tool of many in how to finance a deal.

BRRRRs are a useful tool for the right scenario, but it sounds like you have the opportunity to buy a house with basically no cash in, and with probably some of the cheapest financing available.

Just search the forums here and you'll read a ton about the program.I tell people it is a tool rather than a strategy.

.- Write and publish 52+ high-quality articles on adding the build-to-rent and build-to-sell business models to your real estate investment tool belt.Are you doing all of these in San Antonio?

I'd ask around some GC's that are higher level they may have some decent project management/financial tools if they're at scale.

So, for those people especially it is a small useful tool.

If there issues that need to be worked out with the 6-unit property, I would utilize that as a negotiating tool to work out a seller financing strategy with the current owner. 

Better at finding and screening members as well as giving you more tools to help you manage your PadSplit effectively.