Interesting. I did try Opus 5.5 but it didn't generate models that were as good. A lot of clipping/empty paths. I had it create a drone, the drone frame had very obvious defects where some pieces weren't attached to the frame.

Perhaps my approach was too one-shot, do you have a harness that creates model reviewer/refiner?

Yes, I built this tooling harness around blender, unreal etc. It’s doing a lot of the heavy lifting it learned through trial and error. Best results are Claude driving it, but even local models are serviceable. I find codex makes a more toy like look and feel.