You keep selling model homes over and over to buyers and can make six figures doing it.

Apparently, the theoretical models showed that passive house standards would cost just a little more than normal building costs to get much better energy efficiency, BUT when it was actually put into practice it turns out that the passive house building codes cost LESS than the previous standards to build and are more energy efficient.  

I suspect there's so much vacant land in TX this model just won';t pan out

I’m estimating the re model will cost 10k (so plan for 13), and the additional property about 17K with around 10k re modeling.I’m unsure if I should seek two loans one for each house or bundle them together.

Both are great models.

The answer is to change your model slightly from a fix n flip model to a fix n rent n evaluate model.  

I'm considering a 'rent to own' model for my current 1 bedroom carriage house.

My new adopted model is "live my personal life like Dave Ramsey and invest like Robert Kiyosaki"Thanks for reading this short essay and I hope to get to know all of you on here!

If they like you and your business model, they will lend.

Both provide good service as custodians and have flat fee-per-service models, rather than a percentage of account value, which makes much more sense for what you are doing.