Fitters are on schedule to complete the installation of the tiered seats in the Shed by this Friday (24 March).
Designed and built by Audience Systems of Westbury, Wiltshire, the system can seat over 180 people. When not in use, it retracts, on powered rollers, to the south wall of the building.
It is due to be used for the first time on 3 April when Tetbury Community Choir perform their spring concert in the Shed in aid of the arts centre funding appeal.
Each seat will bear a plaque carrying a name nominated by its sponsor - over 150 local people and organisations helped fund the system by donating £250 per seat. Further funding came from several charitable trusts.