After looking at those sheets and a few other online calculators I have come up with a revised drawing.
If I am correct I think I can reduce the lumber size to 2x6 if I were to built what would essentially be 3 separate 8'x12' boxes and bolted them together sitting on the 12 sonotubes laid out in the configuration seen below.
*Corner tubes will be 6", Intermediates will be...I think 9"?
So, if I were to frame it this way would only the 4 outside tubes be 6", all the rest 9"?
I am trying to keep this deck close to the height of a "natural" step.
Am I close?
If and when I get a proper sonotube layout planned I am gonna have to start looking for tips and tricks on how to get all of them poured to exactly the same height so the beams rest on them perfect, I don't want any posts and would love to do as little shimming as possible........any links for that type of stuff?