I recently read a article in Mother Earth News (Dec/Jan 1997) about slipform constructiuon, which is placing approx. 2 foot forms end to end filling with stone and concrete and stacking the forms on top of eachother to form the walls. I have been unsuccessful in finding any other info. on this type of construction and the details involved to doing it. Can someone please advise where I can find more detailed info. on this, or give any advice.