RX 78粉丝艺术

This is a RX 78 Alex Custom Gundam from the Gundam universe (Not sure which timeline, I don't really follow the story) It is nothing impressive and the rig is attrocsious, But I'm posting this so that people may be able to help me improve my rigging on it as I really want to use it in an Unreal Engine 4 project (As a test character, not for the final game)It is all modeled by myself, but using a reference image