The titans of the value-add model can likely argue against all of the advantages in favor of that model, so I suppose you could say these advantages are debatable.Nonetheless, we proceeded to place the land under contract and begin what would prove to be a grueling 6 month process of vetting all details of the business plan that the sellers had outlined for the development.

I'm looking for examples of materials like this that I can use as a model to create my own. 

Let's say I went ahead with one such deal, would this kind of buy and hold model be sustainable going forward with continued deals, or at some point this isn't going to cut it without real appreciation on the table? 

Very unsustainable model as we work to go digital.

I agree with @Marcus Auerbach that you need to find an agent you can trust to be your eyes and comp-delivery system to make sure the deal is correct.

I think getting multi-family and turning into a STR could be a great business model and is something I’m looking into currently, but it carries more risk for sure.

These are all things you need to have in place BEFORE you think about scaling up and taking on investor capital.Now- the other part of your question about the fund model versus assignment process. 

I mostly stick with buy and hold which is a much easier (and lucrative) business.If you really want/need to stick with the flipping model, make sure your skills are up to par to tackle things that a casual flipper can't handle.

FYI: we went through the Anderson law recruitment pitch, and would have loved to go with them and their business formation model, including the use of the holding company, etc.... 

Not a model of safety, so I don't recommend it.