Mrs Banks said the final design elements would add "sparkle" to the multi-functional events space and would be worked on between now and when the rebuilding phase started in the middle of the year.
"The feedback from residents during the public consultation process was very clear, that it needed to be a weather-proof space which could be used year-round for a broad range of events.
"That led us to look at options to replace the canvas cover with a permanent roof, fill in the floor depression to make it more user-friendly for a range of events, and replace the etched glass front panels with double glazing. All the elements have been designed to work together to provide bright acoustics."
Hastings District Council Opera House and arts precinct committee chairman Malcolm Dixon said the progress being made on both the Opera House and the Plaza projects was excellent.
"A lot of work has gone into the plans for these facilities, to ensure the results are buildings that our people can be truly proud of and will find a multitude of ways to use.
"Council and the committee members have been fully involved in the process, and are very pleased at the way the plans are rolling out. We are looking forward to the reopening of the Plaza early next year, and then the celebration of the re-opening of the Opera House further on in the year."
Following the removal of the panels, a start would be made on removing the columns and the retractable roof.
The recessed floor would be filled with shingle to provide a platform for a crane being brought in to lift the steel that would strengthen the neighbouring Opera House roof.
Once the crane is no longer required, work on reconstructing the Plaza would start and the project was expected to be completed and the facility opened by January next year.