I used it in property management for the financials of about 100 units over 2 properties and I thought it was very efficient.

Have him take a look and communicate with me if interested.

However, I come from a 15+ year background in construction and management, with a nerd-like focus on efficiency and building technologies.  

My job, is to do my job well and communicate effectively.To explain our encounters, here is our email chain."

I should mention I do communication wiring as a day job so I can do this for my time and materials.

How can I get better proof then just verbal communication through the seller? 

Using your equity to BRRRR a property might be the most efficient use of your funds.

All of our communication has been by text/phone thus far until the notice mentioned above when I sent a written notice.

I am a carpenter/natural builder, and work full time for a small yet powerful contracting company doing historic restoration, general carpentry, natural building, and new builds with a focus on energy efficiency and healthy housing.

Communication with your guest is key, when things break or there are issues, the faster you can respond and work to get the issue resolved the better.