I was curious on what their angle was so I watched their short webinar.

Of course a lot depends on your long term goals, but if your real angle is to make your money work optimally you need to strongly and critically examine the utility of doing things on your own.  

My concern is that the property is only 120 feet wide and a 3 feet wide stream borders the edge of the property.

There are no cookie cutters here and a wide variety of properties to "comp" to.  

The fees/responsibilities vary widely. 

I have seen a wide array of answers to these questions.

A good lender will also understand ROI, Cap rates, IRR, gross rent multipliers, and other financial ratios that will help give you different angles of attack.Those are my 2 cents on the topic.

I looked at the lease option angle.  

We get the 1 inch wide slats in off white.

Sewer can be more of an issue since you have to make sure you have the proper angles for efficient waste flow.