I agree with @Dawn Brenengen I'd do it to harden the rental but as a realtor nicer kitchens sell or in this case rent the unit much faster hence shorter vacancy.  

It should be much faster and easier to get hard money than conventional.

Main sill (beam) needs to be removed and replaced though as it is carrying weight of the walls and home.But, it’s never just 1.  

Realize it is a very small sample size (a single SFR).Where most of our rentals are (not rural), the smaller the unit the faster the turnover. 

I have a few buy and holds that cash flow nicely, but I'm looking to branch out and grow faster rather than sit and wait for 20-25% down payment every time.My question is this, if you were due for a raise at your day job, would it be wise (i know in almost all other cases the answer would be no) to ask for a larger one time bonus, instead of the raise. 

For a home that's temporary (ie live in one year before renting), the location is less critical, but the price (ie downpayment) and the ability to cash flow carry more weight.

Most syndicators tell me they'll double my money in 5-6 years, I'm doing it myself much faster than that but I understand the appeal of it from a tax shelter perspective. 

For me, cash on cash return was originally the most important, as I could get my money back and into the next project faster.

You could do things to mitigate the risk like a debt equity blend with an equity partner, or find a deal you can turn faster.

Not great on cash flow currently, but it is building equity faster while I am not relying on the cash flow since I still have a job.Don’t downplay that quality of life point you made- if you’re unhappy there’s no point anyway.