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Duplicating splines in solidworks / tube frame weldment

Duplicating splines in solidworks / tube frame weldment

Duplicating splines in solidworks / tube frame weldment

(OP)
Trying to model a tube frame similar to the ariel atom with the swooping arches and I can't get the two splines to be exactly the same without copying the entity.
I placed 3 points in space and connected them with a 3d spline, I defined the tangent driven dimensions, then I created a spline for the other side with the same dimensions.  The spline's arc length comes out different and it is oriented differently in one direction or another.  
I couldn't figure out the reason for this, but with the tangent driving option checked, I still can't edit the tangent weighting parameters.  The tangent weighting boxes are greyed out and seem to be the only difference between the two splines ( different values ).  

At first, I thought I'd draw everything on one side then mirror it at the end.  I have found that I couldn't mirror 3d sketches.  Any ideas on mirroring 3d sketches? Seems like common sense to be able to have a plane as the centerline and mirror everything about the plane.

Any ideas and help would be appreciated. Thanks!

RE: Duplicating splines in solidworks / tube frame weldment

(OP)
Nevermind, solved the grey tangent weighting option problem and equal length issue by unchecking maintain internal continuity.
Would still like to know of a better way to draw a whole tube frame using mirrors though.

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