Softimage Xsi: Renderable Splines in Xsi??

I'm modelling a very detailed "Mary Rose" at the moment, but i'm having problems with the rigging,


is there a method similar to that in Max, where I can draw a spline curve and render it, without having to extrude circles along it, as this would make the scene overly complicated... even more so than it is now


Any Ideas at all would go down a treat

Cheers