RocketJetski

I'm having the exact same issue as OP, for the most part. I did manage to notice the solution that @Fraktal posted, though, but even addressing that as indicated and applying the fins with 4X symmetry doesn't allow me to click [Next] in the tutorial. I put it down for a day and tackled it with a "fresh" brain, but to no avail. Any advice, anyone? TIA!