Spiker, that is exactly the plan for the posts, and luckily no shortage of hard clay, topsoil is 14-18" deep then hard clay laying over rock hopefully can get 4 ft holes without hitting solid rock, otherwise a drilling we will go, minimum of 36-40" is the target for the posts and then backfill and tamp. Em14 nothing to say but WOW that is a great looking building, did you do most of it yourself or contract it? either way it's definately one to be proud of.