I'm planning on building an 8'x12' Saltbox style coop. I'm going to try to document the process as I work. I also have a bunch of questions for you experienced builders. I guess my first couple of questions are about the coop base. I'm planning on having the base raised 18 inches. I'm going to build an attached run and want to have space under the coop for my hens. How should I anchor the base? My current plan is to dig some 3 foot holes and bury 4x4 treated posts in crushed gravel. Would packed dirt around the posts be sufficient? Also, do I need more than 2 posts on the 12 foot sides of the coop? I can't really use concrete right now, because of low air temp this coming weekend and next week. Thanks in advance!