I really appreciate the support from the community and I'm very happy that many of you like my work. Some people ask me how I textured this project, mostly the device and the broken leg, so I decided to make a short recap of my process with some tips.
Hope this can help somebody, especially who are new to Substance Painter . Because the technique is not too special, if anyone know a better solution, please advise me.
As for a full tutorial, I have plan to make one, but not too soon because it take some time.
Thanks again for your attentions.
And the link to my MAT here: https://www.artstation.com/artwork/JlY8k0

Last but not least. To make sure the details (weathering, scratch, dirt...) fit with your displacement details, you should use micro details.
The technique was described very detailed in this video:
https://www.youtube.com/watch?v=K4wG7dJ-oeI