Stephen, When I open the link to the Cape Coral site, its just to the Citizens shared services page. 

The site has changed tremendously. 

All-in cost of that is around $21k, and we had to get creative to make it work given the drain field site.

There are obviously a lot of variables that come into play.I'm looking at developing a small 2 acre property that has already been engineered for septic and platted for 8 mobile homes. 2 MH are already on site with all utilities present, but for the 6 MH remaining that I want to put on site, the land still has to be developed.

Even a single family builds can vary significantly based on site conditions and required structure/design.

It is a great site, but can be a bit daunting especially as you go down the rabbit holes of all the different options.

So if you are using that site or something similar you could very well over pay for the home.

Ask away. you have found a treasure site and if you follow much of the information here eventually, you will be prosperous. 

If you determine that the numbers look good, make sure to check other sites to see if the comparable property is on multiple sites that may add to the numbers.  

10 years ago my property was 90% VRBO, 10% Airbnbsame property 10 years in using both,now it's 90% Airbnb, 10% VRBOsame property, same pictures on both sites, etc.