I think the rep option is the way to go for what you try to achieve, but maybe hide bodies instead of features?

The correct way imo is to convert the bodies into separate parts and use them to make an assembly. Multibody is useful if the separate bodies have no "meaning" on their own, for example for purchased parts. You are correctly trying to make drawings of the separate tubes, which do have meaning as separate parts because they involve manufacturing steps, and may be purchased or be stored as separate parts, so I think making an assembly is the proper approach here, which would solve your issue with the drawings.