During their review of the draft, the Zanu PF officials said the Politburo used a voluminous document entitled "Critique of the Copac draft," dated July 24 2012, which was compiled by the Zanu PF technical team, led by Masimirembwa.
Other members of the team listed on the document include Fortune Chasi, Aston Musunga, Jonathan Tazvitya Mapfumo and Mercy Chizodza.
Analysis' made by Broadcasting Authority of Zimbabwe chairman, Tafataona Mahoso and unnamed public service officials, were also used to review the draft.
The senior Zanu PF official said the Politburo later agreed to use the party's technical team to produce their own version of the draft constitution by Wednesday this week and present it for adoption by the two coalition partners.
"If the other parties refuse to adopt our draft, then we will have to take both versions of the proposed constitution for a referendum so that people will decide what they want," he said.