Most people that are successfully flipping have a flipping business with either employees on staff or enough work lined up to keep a GC happy for 6 months to a year.Its a tough business to make money in when you are doing one project at a time from a distance. 

As long as I keep track of what expenses belong to which LLC, is it safe to continue running all of the payments and credit cards through the holdings company and then just divvy it up during tax time?

Reach out directly via phone if listed or in person.

Like @Brian Burke said there are many different ways cash flow can be handled and waterfalls structured.To keep the same example but for a 9% cash on cash return:$100,000 starting capital account balance$8,000 preferred return accrual (return on capital)$1,000 excess cash (return of capital)($9,000) total distribution (preferred return distribution+excess cash)$99,000 ending capital account balance

Also - I am a very analytical person; scientist by profession. 

Have you seen the past projects in person? 

We're constantly improving the platform to keep it fresh and up to date.

Your comment says a lot about the type of person you are.

There is a person in California who asked me to move into their house to rent but I am more interested in buying the place as it can be turned into a multifamily property.

Personally, I would only purchase for STR right now on either very unique/special properties or on those that also work out as LTR.I am a licensed REALTOR who is investor focused.