I like cheap-o engines. They are fun to play. You were definitely correct to go for it.
I am always tempted to grab a second Ironworks in games like this (e.g turn 3) because you just can't have enough cheap pieces. I definitely agree with the game plan to pick up Pearl Divers and lots of Throne Rooms and Menageries to give yourself draw and some actions to play with.
I think you could have made it easier on yourself if you got a Navigator and a Gold to bolster your economy and add variety; for sure Gold-Menagerie on turn 10. Also at least one Courtyard on a spare gain for variety and smoothing. You should have the actions with TR-Menagerie/PD.
Depending on how it goes, Watchtower could also find a place here -- to put cards on your deck, probably not so much for the draw.