I'm considering many different ideas for the spine support. My concern with a wood dowel is that it will bend (warp, sag) over time - even oak. PVC pipe and acrylic rod will have sag. Maybe thin-wall brass or copper tubing filled with expanding foam? I do have a 1/12 Gemini capsule w/ docking target hanging by a single line over my desk in the basement (location: New England, US). I used a wood dowel down the center of that. I does not seem to have sagged over the last 4 years, but with the disparity of shapes, it would not be too noticeable unless severe. The length is just over 36". With the Discovery, and the repetitious shapes, I think any sag would be much more noticeable. Thoughts anyone?