The delivery guys say they have never had to pick one up for repairs.  

If you are paying a lower than current market interest rate then don't pay it down because your debt service is cheap.

Hello Matt, are you only doing prefab wall panels, where they are assembled before delivery, or are you going to the next level with a full Prefab modular construction, where the units are completed at a factory and relatively minimal work is completed on site.One issue I have heard on the modular construction is the manufactures are sold out for this year.You might want to check out www.VuhausLLC.com/models they are doing high end modular construction.

Don,  great points as usual from my cheap seats what I see coming down the pike and have personally experienced over the years in Sub to is this new crop of Guru pitching this form of acquiring real estate..

I target cheap C+ class homes because turnovers amongst this class of tenants is almost zero, and the profits are much higher.

However, options can probably be used to flip properties for smaller profits and less risk on a more continuous basis.Purchasing properties (hopefully) cheap, keeping them in inventory, and selling for profit when the opportunity arises is much more difficult.  

Copper is expensive, you want to use pex (and make sure they don't buy the cheap stuff from the big box store).

Even thought it needs extensive repair due to damage from the tenant and since I live in the front unit, I don't think I can deal with a renter living free, getting uber eats delivery and working without paying rent.

@Daniel Stevens Flint really has nothing positive going for it these days and Burton is rural - hence the cheap prices!

And I noticed that many of the unfurnished units were offered with a month to month lease... the kids would get cheap furniture that they didn't care about tearing up and giving away when they were done.