looks really great! thanks for sharing!
I’d challenge you to reduce the number of faces on your SubD parts.
Instead of subdividing a few times and getting tons of faces which can be hard to manage and model smoothly, try insert edge (or edges) to add just the edges you need.
remember, you only need three edges to make a transition.
Simplifying your topology will make faster, smoother, and easier to manage SubD parts.
see this video.