Just a nice safety touch, not needed structurally.Rebar:- 6x6 welded wire fabric, recommended.

I graduated from my MBA just back in 2012.I can say with certainty that most of the things you've been led to believe about wealth and happiness are complete fabrications.  

Account Closed on site fabrication seems to be one of the biggest benefits. 

You'll also know in a heartbeat if they are there working.Everything requires lead time and if you don't stay on top of it you'll be sitting on your house longer than 2 months.For example: Lead time for our countertop installers to come out and measure for the quartz was one week. 7 weeks for fabrication and installation.

The granite guy and his helper would buy their pre fabs in Anaheim and then fabricate in the driveway.

In that day, insulation was fabric wrapped wire.These 20's and 30's homes can be interesting architecture, buy REI's aren't architecture preservationists  (baring Queen Ann and Victorians), so you've got a major GUT and restyle project IMO.

At the time of purchase I was given a rent roll for one month which I learned after closing it was totally fabricated.

If you're not replacing it for insurance reasons, you could consider having it professionally coated with a hybrid system consisting of polyurethane-modified acrylic and reinforced with fabric.

Have removed all fabrics, carpeting, etc.

Have you considered just placing pre-fabricated tiny homes out there?