And given that, in a major city, there are hundreds of houses put on the market weekly, you need a method to efficiently screen properties to make sure they won't bleed money before you spend time analyzing, touring them ect. 

After all, spending a few hundred dollars now is far better than risking hundreds of thousands later.Yup. 

Will end up costing around $120,000 once tile is set, bathrooms and kitchens installed, and custom cabinets/Doors/ and furniture are built; windows installed. 

Chris is telling you to provide more details.The people on this thread have a combined hundred years of experience, conflicting opinions, and have been real with you.

To maximize the sq/ft (and save cashola) and give it a more spacey feel, I’m doing open shelving instead of upper cabinets and the countertops will extend all the way to the near wall, fully covering the front load washer and dryer units, which also have their home in the kitchen.

I will be short by a couple hundred dollars.I believe the interest rate needs to be at a reasonable percentage.

We have a property management company in New Jersey where we make some of our best clients hundreds of thousands of dollars between helping them force appreciation, increase cash flow, finding them deals etc.

You wouldn’t magically have access to hundreds of thousands of more dollars if your credit score was 20 points higher  TLDR: You aren’t being harmed at all by being 780 instead of 800+.

Obviously it's a start but I don't think I can cash flow more than a few hundred dollars per property with zero down so what do I do next to keep growing my portfolio?

Typically this takes 6–9 months, including 2–3 months for permitting and 4–6 months for construction.You can browse their current plans online, with design costs ranging from a few hundred to close to $2,000: ADU Fast Track Plans2.