From the starting research that I have done if you would create a "Objectivist-based Religious" Society and can prove that you can be 100% independent in regards to energy, food, shelter, protection, schooling, etc. and you live on private property without anything but an entrance/exit to state/federal owned land then you annex that property as independent from state and federal government. Now, those conditions change from state to state, but I guess the easiest way to explain it is it would be like creating a technologically advanced Amish community. The humor of all my research is that the funding of the society (for protection services only) could be done by leasing the land to the member that builds their houses on as condos...wait, that's right, NH is already doing close to that by only charging persons property taxes (Corporate tax is another story). In regards, to raising the 150m capital, believe it or not, many people would fund say $1000 to be fed day to day updates on a peaceful withdraw from the United States, and there are also some very brilliant and extremely wealthy people that have only fled the United States and spent millions of dollars to do so to escape the taxation and tyranny of our communistic government. The ability to come back and live free is worth millions to them to reserve the plot of land. For instance, there is a flood gate opening for the 1%-ers from all over the world over the age of 45 to retire in belize due to a tax free import exemption. My only concern with NH as that Galt's Gultch location is the same as Wisconsin...the growing season!!! That is were states like Texas or Oklahoma works a little better. In regards, to existing laws to accomplish the task, you NH'ites are definitely the closest to doing it with ease!
BTW - Thank you for the response LakesRegion...I was starting to wonder if anyone was active on here.