You see, altough all parts are there (and the PNGS that make them are ok, I double checked) some of the parts just decide not to appear when doing the rig (making it even more difficult) but they do appear if I select their layers) they're mostly inside switch layers. Look:

But you see, If I advance the timeline to frame 70... I can see them! (well, except for the lower arm as you can see) I really don't know what's going on.

Could you please help me? I would love to get this done so I can start animating and thank you for all support on the matter. Have a good day!
By the way. The girl has the lower parts of her arms and hands on switch layers because the lower arm can be exchanged for a Front arm position, and her hands can be closed or open.