2D skeletal animation with customization?

i am looking for some tutorials about 2D skeletal animation and part customization.
i found some “flipbook” thing but this “frame by frame picture” thing is not i wanted.
there was a lot of tutorials about 2d animation with unity but i really can not find good tutorials for unreal engine.
what i am planning is “2D skeletal based animation character” (like puppet. not some kind of tool) with replaceable parts (short arm,long arm, fat body,thin body, big eye, small eye … ).