The floor/ceiling separation won't do any good if the walls supporting it burn and crash.

Same siding,roofingm windows, energy star package, 2×6 Sidewall with R-19 InsulationSo what is the difference between this and stick-built or modular?

Don't burn hundred dollar bills.

If it is go with the distressed look , I have 1 unit after we sanded we beat the floor with a chain and took a torch and made some burn marks , then stained and put 3 coats of gloss poly , it looks great 

Creating something unique and special takes more time and energy.  

Keep in mind your goals, time, energy, and the lifestyle you want to have or are willing to have. 

Then she threatens to burn the place down.

If your nest egg is 60k, I would not get started yet if you are willing to burn half of it and can only make 1k/month between you to add to it.

@Angela FondeurI would focus all your savings and energy on saving up for a house hack.  

Not to mention it would be so much less of a headache and so much less time and energy invested on your behalf, plus much less exposure to risk, easier to manage etc. to just buy a single multifamily for $800k in a good location with strong underlying fundamentals.