I am sure some of our comments come off as curt, that is not our intent either. Speaking for myself, I get the feeling you only are interested in recruiting support to what you want to do. I question you have any idea as to the cost of things. What is cheap insulation? Either you have adequate insulation or you do not.
In the link Trail-explorer provided, do you see any cheap trailers?
I do not have a geology degree, nor am I employed as an engineer, but that does not dismiss anything I have posted nor the information provided be others. Many if not all of us have a little knowledge on the subject. I have drank many gallons of beer in my life, and have a pretty good education, but I haven't the knowledge nor equipment to make beer.
I respect what you want to do, but it can be done and will not be cheap as you appear to think it is.