If they don’t perform for three to four months I can fire them and revert back to traditional buy and hold with the bigger established PM company but they retain 49% ownership.As an Airbnb prelim math says I will be out of the “red” in 2-4 years.

Lower home insurance and the other benefits of a new build.I just wanted to hear what the community things and if there are major red flags to putting more than 25% down.

I've heard mixed opinions on this, I'm trying to see how much of a red flag if any that creates. 

This stands out as a red flag to me:"The owner said he doesn't have monthly financials to share with me."

Theres a saying about "cheaper by the dozen but 5 is a red headed step child...". 

SFH "A" in Johnson County is red hot anything hitting the MLS is priced to the point of no meat on the bone for an investor of course there is a few expectations to that rule.The only way I have found deals is word of the mouth, fact I am looking at a SFH "A" right now, but the amount of work needing done and the value the owner thinks it is worth is a spread that may not shrink to the point of a trigger pull.

"Instagram model"...thats the first red flag.

See it in red in picture. 

Young tenants just out of school are generally a red flag group that often are transient and haven’t got their life together on coarse .

What you think you'll save, you will spend in purchasing.Find an honest, reputable builder that will work hand and hand with you and in the end, you'll be a happy man.Luke 14:28  For which of you, desiring to build a tower, does not first sit down and count the cost, whether he has enough to complete it?