shelling multi loft part

Part In Question

I have this model of humerus bone that i need to shell the entire thing of. I have tried dividing it into many pieces and shelling individually but i all-ways end up with having bits that wont shell due to the radius of curvature. If i was able perhaps convert the model to a smoother surface model it would be easier?

Can anyone give me any advise?

SolidworksParts And Features