Right now if you place two meshes inside a brick, only one will be rendered.
Why is it like that?
If you want to add an armor to the torso, you need to attach another brick to it with the mesh in it.
It seems rather unnecessary and it creates weight issues, unwanted character-parts causing unwanted collisions etc.
Therefore I suggest all meshes inside BasePart should be rendered.
TL;DR If multiple meshes were allowed it’d be so much easier to make custom armors for characters.