Steeper seating will create a "cauldron" effect drawing spectators closer to the rectangular playing field at the revamped Olympic Park sports stadium, designs for the $810 million project show.

As the Berejiklian government pushes to finalise a developer to complete its $730 million Moore Park stadium rebuild, work is forging ahead on plans to refurbish ANZ Stadium at Homebush.

The government wants to reconfigure ANZ Stadium at Homebush into a permanently rectangular playing field.

The government wants to transform the 20-year-old structure from a circular playing field into a permanently rectangular stadium with 70,000 seats, which is 15,000 fewer seats than the existing venue.

An architectural and design report, published as part of the project's environmental impact statement on Wednesday, said the Cox Architecture design would include a new roof arching over the structure and changes to the lower and middle seating sections of the stadium.