This way you have a sliding scale that can account for discrepancies relating to property condition i.e. quality and desirability of each property.

Most having to do with economies of scale. 

@Patrick Liska Unless you're getting a manufacturer's incentive rate.

The problem is that it is very difficult to operate larger scale in these rural areas.

Mobile home park and manufactured housing investing has been "in vogue" for some years now. 

If you're having trouble getting deals then reassess your acquisition criteria and see if you can scale up on your quality and still project to make similar returns.

I have used spreadsheets in the past and they work fine on a small scale but as you get bigger they become very labor intensive and cumbersome.

Now that we are about to close on our current flip, we are ready to do another and potentially scale this year.

Smart locks is a term used by several manufacturers.... some with keys and some without.You are probably referring to "keyless door locks", which may be mechanical or electronic.

I currently work for a civil engineering company and have a very good understanding of the due diligence and approval process in getting this done; however, the financial component is above my pay scale.