[jyl]

One thought - Are the footings secure, especially the ones that are leaned over so that a line drawn down the centerline of the post passes close to the edge of the concrete block? I see a couple that look uncertain. Especially if people walking, running, jumping on the deck, and/or moving weight from one side of the deck to the other, cause the posts to eventually shift from vertical. Perhaps you could tie the posts together at their bottom ends, right above the footings.

Considering that a deck like that could potentially have 30 people (6,000 lbs) slam-dancing on it (so dynamic load many Xs the static load). Not that it will, but it should be built as if it could.

One more thought - are pool bottoms very strong? I don't know what thickness the concrete is. Suppose 20 people cluster around one post and jump up and down?

Just asking - I'm sure that MIT education hasn't gone un-tapped in designing this thing.