Seems that I need to buy the 14 inch rough in toilets (which is hard, because only few models are available at Home Depot and Lowes, since this is a non-standard size).

It is getting quite a bit easier to do this and I am working on a new business model to allow promoters to do their own portal while operating as a small part of a bigger network.  

And for sure sellers should basically never do them unless they are going to lose the property and they will get some equity by doing it and their credit is already trashed.. this was the model that i ran for all my sub 2 when foreclosure rescue sub 2 was legal in OR and WA. big times laws now..

The contractor causes injury to someone visiting the property (instpector, delivery person, etc.).  

The appreciation models only 3%-4% for SSF which is normal for 1 mil avg houses.Do not do ADU stuffs.

The financial model presented seems overly pessimistic.

That can change the value but the AVM models can't factor that in. 

The mid-term furnished rental model  has been a consideration.

We've built a model for Northern Nevada that analyzes ever single family and multifamily property on the market and ranks them by cap rate. 

For development, like she mentioned, the Urban Land Institute has online courses on various aspects of development, as well as on financial modeling for R.E..