I am currently working on gathering supplies now.I want to build it big 8x24 -12x24 but we will see how much money I have to spend. I was thinking about having the shed off the ground 18" to allow extra of air flow using boards as decking leaving 1" space. On the walls I was considering using boards in a staggered pattern 1 outside 1 inside,1 outside 1 inside. To allow more airflow while keeping any driving rain or snow out of it. There is a local guy with a bandsaw mill and cheap prices on wood, any input on what kind of wood I should use for siding, flooring, roof? I will be using cedar posts (logs/trees) and pressure treated for the floor joists. I haven't decided on shingles for the roof or tin, leaning towards shingles only because of cost. Any input will be appreciated, point me in the best direction because I only want to do this once and I want my wood to season rather than get punky.