  The Cherenkov Telescope Array (CTA) is the future instrument in ground-based
gamma-ray astronomy in the energy range from 20 GeV to 300 TeV. Its sensitivity
will surpass that of current generation experiments by a factor $\sim$10,
facilitated by telescopes of three sizes. The performance in the core energy
regime will be dominated by Medium Size Telescopes (MST) with a reflector of 12
m diameter. A full-size mechanical prototype of the telescope structure has
been constructed in Berlin. The performance of the prototype is being evaluated
and optimisations, among others, facilitating the assembly procedure and mass
production possibilities are being implemented. We present the current status
of the developments from prototyping towards pre-production telescopes, which
will be deployed at the final site.
