There are very few free lunches, barns demo included. We took one down this spring I doubt we would do it again. Taking it down piece by piece,removing nails cleaning stacking hauling and properly caring for the end product could take two people with no equipment 300 plus hours. You likely wouldnt save any money on erection of new cabin when you have to retofit new vs old. However if its your burning passion and you have the time ,go for it.Youll pay for the amish in our area to take it down plus they keep the wood.