C60 with each bond built from two spherical beads and one tube

In the following figure we show the beaded model for C60 based on the composite bead technique. The final shape is not quite satisfying as we can see it is a little bit distorted. This is probably due to that the sizes and shapes of the constituent beads and tubes are not exactly the same. I believe a better structure can be constructed if we can control the sizes and shapes in a better way.