Well… I’ve got some experience in unwrapping. And at first I used Smart Unwrapping. But as my friend told me once… That was Konstantin Horn, by the way… the Unwrapping is a real creative process. And I agreed after some experiments.
So It requires some of space imagination and will to get what do you want. If you are in lack of time or experience, Smart is a possible way, but not the best. And still needs some corrections.
So Lets see.
The first that I did - made Smart Unwrap.
It does not look too bad. From one side… But from another it requires… Corrections.
Rotation of separate islands.
Look how it was made by Blender:
Not bad, but half or more of details need rotation.
This is not very simple and not very complex model. Probably middle complexity.
And you can spend time making corrections and guessing what it can be in final.
I decided to make manual mapping. Selecting edges and edge loops and making manual aligning.
Its up to you what to do 