Sources close to the £7 million competition-winning scheme (pictured), originally scheduled to open last November, say the project 'has to open' within the next few weeks to tie in with pre-arranged celebrations.
The practice - best known in recent years for its infamous Diana Memorial Fountain project - was selected to masterplan the overhaul of the city centre square in late 2004.
However, the development, which started on site in October 2005, has been beset by a series of delays and problems. Among the reported setbacks was contractor Balfour Beatty's problems in 'sourcing' the specified stone.
Once complete, the remodelled square will boast 'new water terraces - a stunning lighting scheme and an under-lit glass strip denoting the alignment of the old city walls.'
Gustafson Porter was chosen after a public exhibition ahead of bids from Gillespies, Patel Taylor, Stig L Andersson, Hopkins Architects and Conran & Partners.