Really, where I seem to use these most is with a client that has several million in stock market investments and wants access to funds without selling the stocks and paying the capital gains taxes.I probably wouldn't advise this...but you could look around for a custodian that has really cheap margin rates...and open an account there...and then take margin out of the account...That's what I do personally. 

1st off- Kudos for your enthusiasm to tackle a difficult problem; adopting new materials and building science understanding on really old structures.Success levels for energy retrofitting will be directly tied to the level of "gutting" you do to the old house, especially trying to add a vapor design and passive ventilation retrofit. 

What are the quality of your clients?  

But if you want to gut check anything or ideas on what you should be asking, I'm happy to connect.I'll say it's incredibly difficult to REALLY vet someone.

Our cleaner has indicated we are one of her busiest clients. 

Hopefully the utility will not be difficult collecting for the damages they caused.  

Quote from @Bruce Woodruff: In my very humble opinion, do not over think Real Estate, it's not necessary and this a a seat-of-your-pants game anyway...Couldn't agree more.I tell clients, it ain't that hard.

@Sara Habtom My extremely trusted contractor has been reaching out to some of his other investor clients to see if any of them want to sell anything for me.

Sometimes, when appraisers can't find comparables like the same ones, it will be difficult for them assess the value.

Take time to think about what you want to say or ask when put in a difficult situation.