Note: Florida charges a hefty tax on rentals under 6 months. 

Be mindful of short-term capital gains tax, as profits from flips held for less than a year are taxed as ordinary income, and frequent flipping may result in self-employment taxes.While profits from flips do not qualify for 1031 exchanges (since flips are considered inventory, not investment properties), you can minimize your tax burden by deducting allowable expenses like renovation costs, loan interest, and holding expenses.If you're considering diversifying into rentals, explore opportunities to benefit from long-term tax advantages such as depreciation and lower long-term capital gains rates.

For example, could I use my SDIRA to operate a management company that charges my holding LLCs a management fee?

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

It'll be easier to manage and you could have less frequent turnover. 

One thing I am curious of - typically many of the hard money lenders will charge a 1-3 year pre-payment penalty in these types of scenarios unless your client paid points to not have that pre-payment penalty.

Legitimate lenders may charge a small application fee (around $250) to verify you’re serious, but if someone’s asking for thousands with no real intention of closing, that’s a huge red flag.On a more positive note, there are creative financing approaches out there.

My absolute best advice with ANY STR prospecting is to contact the municipality in charge of regulating that area of region.

What are they charging per night? 

An appraisal fee in advance for an actual appraisal is legitimate, but you can find lenders that don't require appraisals and don't charge appraisal fees.