The interior construction.
The interior design is quite lengthy. It is likely that you never really finished, because in such an observatory will change something from time to time. Fortunately I was in the installation of the technology already as carefully as possible and build in thick cable channels. Although the detached collumn pull trough the intermediate cailings, I don't waived to step sound insulation , because such a telescope is extremely sensitive and for bulb exposure vibrations are impossible. Despite all these precautions, the vibrations of a strong step in the dome area is after about 5 secounds by the telescope. At high magnifications is to see a brief tremor of the observed objects!