I have been interested in ferrocement for some time, I just did not have a place to build with it - now that I have a small homestead I am working on a ferrocement building guide - right now I am working on a FC conduit dome and a FC cabin - but the intent of the book is to start with limestone, cinter it with clay to make the portland cement and build a variety of homestead projects from animal hutches and shelters, fencing, water storage and aquaponic tanks, and of course a few types of buildings.
I recently shot some youtube footage on slaking limestone and building the dome frame.
The book project is in its last week on kickstarter if you are interested in seeing the videos I have up so far.
http://www.kickstarter.com/projects/tngun/ferrocement-for-sustainable-living-a-guide-for-bui
cement has a negative reputation in regards to sustainability - but it can be made on site in small quantities and it absorbs carbon as it ages (which makes up for the carbon it releases as it is formed) - I like it because it is a flexible material that is inexpensive and owner buildable.