If it's based mostly on pricing models, inflation and national trend charts, then possibly.

I personally built around a 10-12% cap rate, $150/door model with purchase at or close to 80% ARV when completed.

Discovering BP has played an integral role in providing me with valuable resources to make decisions and creating a business model.  

The IRA LLC model has been around for more than 20 years and has been tested in the courts.  

You want a flat fee / fee for service model, not a model that is based on the asset value.If you qualify for the Solo 401k and would have other reasons to take advantage of such a plan like the desire to make higher contributions or other investments, then it might make sense to explore that platform.You don't need the checkbook control of the IRA LLC or a SoloK for a single land asset.  

However, being new to the area, I'm not sure how stable this is or what it started out as.It would be an interesting study to see what each State is going through at the end of 2015 to get a glimpse and hopefully forecast 2016.

A "Supply-side" economics model, in a way.  

The benefit of using an open input model like excel is that you can adjust prepayment levels of the loan which if the loan is purchased at a discount will have a direct impact on your IRR.  

However, Georgia State Economic forecasting center predicts more jobs in Georgia.

That said, real estate investors here usually go for a long term appreciation return due to a break even or even negative cash flow model on a 20-25% downpayment.