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I vary preflop here between your line and set mining, depending on whether I think villains would pay off...by just calling, you're giving BB good odds, and your implied odds are pretty high. But against such an aggressive button stealer, my "default" is to 3-bet as you did.

I think the flop bet is fine since overcards are obviously a huge part of his range. But since he's ultra aggressive, you need to be prepared for a raise on the flop.

I'm a little nervous when the ultra aggressive guy just calls the flop bet, but really we don't know how he plays, so it's not that huge of a deal. However, you're so likely to be behind when he calls the turn, that I would just check. I'd call a bet from him since he'll bet with a wide range, but I don't think a free card here is terrible, either, if he decides to check.