We have recently purchased a small cabin that sits on a rather steep hill. I have included a photo, but the only one I have available at the moment so not the best angle. The house sits on wood posts that go into the ground and I assume sit on concrete footers. I want to enclose the bottom of the house, primarily to help insulate under the house, provide additional stability, to provide some storage area, and maybe even install central hvac, but it would not be a living space. I am trying to determine the best way to do this, but the steep grade is a big concern. I am thinking of building walls between the posts and looking for ideas on doing this. I am thinking that the posts would remain as the points holding up the house, so I do not know how that would affect putting in foundations for the walls. Any suggestion?