The first link you've shown is an entity I believe. Minecraft render armors as 2 dimensional and not 3rd dimensional.
Yes I know that, but it's not an entity it's my armor than I built. But I need to change the Minecraft basic armor model
Maybe a chance with use the packets to send a new armor system in Minecraft graphic rendering ? But I'm very bad with packets and I don't know how to use it
Sorry, I'm mistaken. Seems like you can create 3d armor. Check out this texture pack https://mcpedl.com/3d-armor-details/
There’s nothing you can do with “packets” to create 3d rendering for armor? You can make it so it cancels armor send though(but again, nothing you can do to make 3d armor with this) You can try texturepacks
This method is too unstable. We can't do really an armor with defence points and we can't equip only one piece.
Have the first entity sit on the player, second one on the entity thats sitting on the player…and so on. Very bad method But you can still have a check for them and ig implement the “defense points” with it. I think texturepack is really the best method