I have experimented with this type of modeling for a RTS game I'm building: https://playwarpact.com

Few things:

1. Opus 5 is just as good for this tbh and cheaper.

2. They don't generate optimized 3d models. They have high poly count for simple geometries.

3. A better approach I've utilized for game ready assets is to use the model to create low poly silhouettes of the 3d model and then bake textures that include a lot more details like windows, doors etc with tools like Meshy. Can post a tutorial if there's interest.

The models need some more RL to be able to do this autonomously.