Finally I got the parts I need and I made the biggest Sentinel in the X-men series, the Master Mold.
Being a giant Sentinel created by Dr. Trask, Master Mold is to control other sentinels and produce even more sentinels to hunt down the mutants, hence the name. In the LEGO 76022 set, the sentinels look like the comic version instead of the movie (the purple ones not the transforming ones). I keep the same style and make a boss version. Instead of being a building-size robot, I just make it a more muscular robot with the same gold touch for its hands and feet. That will probably give the X-Men a headache for now!
It is a small MOC, and fits great with my superhero display area. Hope you like it!