<comment> The carbonfiber shell covers the outer 3 disks and intercepts with the diagonal cone at TrackerEndcapOuter_rmax1 * TrackerEndcapInner_zmin/TrackerEndcapInner_rmax1 ~ 60cm </comment>
<comment> build the cone from inner barrel endcap to outer barrel endcap1. For now can not make zmin start at the inner endcap location, will overlap with outer barrel volume </comment>