So many newer investors are obsessed with underwriting models as though the most intricate and complex model will deliver the holy grail. 

The biggest hurdle in the Scott's model is the Deed for Contract.

Send it by US Mail with proof of delivery required and/or place it in an envelope with their name on it and post it on their door. 

CT isn't cheap so if you plan on doing it there you are going to surprised at how poorly you do. maybe in the suburbs I'm not sure but as much as I know people call us from CT and everyone is rich and has lots of money and things are expensive out there. build to rent is a great model. we build 3 story walk up infill and keep it to the residential side. 3 units is the most units before it's commercial and you need engineering, etc. check comparable and things liek that. we came up with this design a year ago and we sold 10 if you want to talk further please DM me happy to connect. there are some great build to rent conferences. we went vertical not horizontal with it to save on build costs and design to fit on any infill lot. this fits on a 3500 square foot lot. most lots in our area are 30x120 or 30x150. in miami where I live now they are 50x100 or so. but any infill lot we can pretty much get this one on. there are some great build to rent conferences coming up too that if you like this topic I'd recommend attending I'm sure you'd learn a lot.  

Presentation and delivery is MORE important than content because that comes first.

You can read about the differences here: Cost Segregation Study Approaches ExplainedLet’s first start with what the approaches:Detailed Engineering Approach from Actual Cost RecordsDetailed Engineering Cost Estimate ApproachSurvey or Letter ApproachResidual Estimation ApproachSampling or Modeling Approach"Rule of Thumb" ApproachSo which of these approaches is required by the IRS?

You also have to ask about delivery costs and more.LABORLabor charges are trickier to understand, but Google AI to the rescue! 

This model (Dressbarn), according to Santarelli, was so successful that they duplicated it over and over again (37:44).

  :)   There's so many Gurus pitching this and that without mentioning the risks to them and to the buyers.So glad to hear re your business model being fair to the buyer.   

Unsure about STR regulations in Charleston but I would advise you to search "arbitrage" on this forum and read up on the hundreds of pros and cons responses here before diving in to any market using the arbitrage model.