Even to me, a real layman in this business, it just sounds like someone can save a TON of headache by doing this, of course, only if this is acceptable under the relevant laws.

You want to build a list of REPEAT customers so that everyone wins.

But before I move on to the next lead or pass these on, I'd like the input of those more experienced becasue if I can actaully help her somehow, someway, i think i'd be off to a good start both from a customer satisfaction standpoint as well as educational...

Your tenant is your customer.

The window is an odd size, VERY large custom window.

His expenses are probably not that relevant as I assume you will run things different (aka: not doing rehab yourself).

I paid the lenders' high rates which caused me to paus and really consider how much money, in dollars, each investment needed to make.This was a great experience in terror and inconvenience as I had many of the disputes with bureaucratic credit card companies that others have, dispite being what I believe was the ideal customer/borrower.

Letting them have some control of customizing would need to be accounted for in how the pricing works out as well.

The biggest shout out goes to the customer service team who communicate monthly with our clients building relationships and trust.  

Remember that the term of interaction between a landlord and tenant is of much longer duration than that between a merchant and customer.