[Zeke]

Steve: note the overspray on the gussets that was the antiquing glaze. There is none on the fabric or seat bottom suggesting that you are correct that the seat will wiggle out somehow. It is very unlikely that any chair was glued up after finishing surrounding a cushion. Never seen that, but as I said I steer away from this.

It is slightly possible that the fabric was pulled under the platform and stapled. Sorta looks like that could have happened. If there are no concealed staples that's a big clue.