As well as a number of smaller detail changes, the practice's revised design for the £7.2 million museum has replaced the original scheme's terracotta and brick facade with a wraparound 'rusty-looking' Cor-ten veil.
Given backing by the Heritage Lottery chiefs back in January 2006 the project - and ASL's role on it - hung in the balance after an OJEU notice was issued by the project's client (Austin-Smith:Lord wins museum grant but faces possible chop from scheme).
The new ASL scheme will amalgamate the museum's two sites, currently at Manchester's Pump House and the Princess Street building.
The completed museum will host the National Archive of the Labour Party and collections relating to the TUC, the UK Communist Party, the Women's Suffrage Movement and the Co-op Movement.
Work is scheduled to begin on site in November 2007 with a reopening pencilled in for May 2009.