But in turn you get a cheap product at the latter two… they work fine but they let a lot of light through.

Forget about the LLC and asset protection classes, be good, have insurance (an umbrella when you get rich) and abide health and safety codes you will be fine.

Hello, I was trying to buy a property and everything’s fine until I got the appraisal report.

I’m fine waiting out the redemption period before taking possession but I don’t want to tie up funds if I’m not going to get the property in 6 months. 

I’m fine waiting out the redemption period before taking possession but I don’t want to tie up funds if I’m not going to get the property in 6 months.

Other than that, an SFH that operates as a duplex works just fine and is basically identical.

I’m fine waiting out the redemption period before taking possession but I don’t want to tie up funds if I’m not going to get the property in 6 months.

It's fine.

Then you call a licensed roofer who examines and confirms that while the roof is older than xx years old there are no issues, no active leaks, and should be fine for 5 to 10 years more depending on weather/conditions.

If you're doing it "outside of closing" I guess that's fine, but realize you'll be signing documents at the closing attesting to the fact that you're not doing something like that.