With a conventional loan, you could absolutely get into a SFH and rehab it with 30-40k in the 6 month timeframe you noted.

You're way past the time frames that would have allowed you to take advantage of the primary residence exclusion. 

Stay with inexpensive, easily replaced and repaired standard windows.

They are free for Pro-members and inexpensive for non pro members. 

They only need to close within a time frame that includes the first one to sell (in other words they all sell within 180 days of the sale of the first property) as long as you can locate the right replacement and get the right terms.Another very attractive option would be to scale down a little and maybe look for a replacement property that you could get for $600K - like a 2.4 - $3 mil property that needs $400K of work to get it to high functioning. 

I would say if dems take house and senate and negate the trump tax cuts that will have a very large negative impact on small businesses who are a big driver In the economy.No matter what, 2020ish timeframe expect a decline in home values and economy

If you go to meet ups you will find plenty of OOS investors, common in expensive markets like the one we are in.

I really liked getting multIple original designs to choose from, but it wasn’t exactly inexpensive.

What was the time frame?..

If after factoring in expenses and reserves you only collect $800 a month, paying a $737/month mortgage may not make any sense.