This is the second, more developed sketch of the DCA. Here, on the top, the hemispheres are shown open, revealing the shelf within. Below that, on the left is a picture of the primary drive, which will be stabilized and aligned by the two concentric rings of the tray. On the bottom left is a side view. The ugly red lines are copper tubes running into the band separating the hemispheres.

[...] can also check out the blog entries covering the various stages of design and fabrication here: Sketch, CAD, Fabracation: 1 2 3 4 5 6 7 8 9 [...]