Followed papyblaises suggestions. Found it difficult to realize. Many attempts failed. Eventually I got the result as in attachment. I wanted a 6-tube truss. And I wanted to use a spreadsheet for sizes hoping to be able to steer the sizes from there when I want to change things.
I got error's like so:
12:31:38 Transformed: Result has multiple solids. Only keeping the first.
12:31:38 Cannot compute Inventor representation for the rejected transformations of shape of PolarPattern.
And so:
12:33:51 AttachEngine3D::calculateAttachedPlacement:InertialCS: inertia tensor has axis of symmetry. Second and third axes of inertia are undefined.
12:33:51 AttachEngine3D::calculateAttachedPlacement:InertialCS: inertia tensor has axis of symmetry. Second and third axes of inertia are undefined.
12:34:29 AttachEngine3D::calculateAttachedPlacement:InertialCS: inertia tensor has axis of symmetry. Second and third axes of inertia are undefined.
I'm not sure if some of my sketches aren't good enough causing these error's.
And I see a strange rectangle in the top of the truss at two places which I do not yet understand.
Happy I've gotten this result and many thanks both to thomas-neemann and papyblaise who got me so far.
I will now proceed with the other parts detail design and trying to put it all together.
Probably still some hurds to conquer....
Kind regards, Jetze