Well the Stadium is at 22,000 at the moment, The new Top Deck would add...
2750 Extra Seats,
500 Seat Conferance Venue
Full Gymnasiam Open to the Public.
The Next one (Northen Stand) would be the same, then it is up to moving the Light Towers to put the corner stands together (Maybe having More Squat and Wider Lights right on the Roof), which could take it to about 30,000.
Then I just think we need to put the another deck in behind the Cronin stand, For Food/ Drink and Toilets, and have the Stairs coming out at the top of the Stadium Asiles to stop having people walk in front of others while the game is on. Giving more access space on the Terrace (This also might involve Re-concreating the Stadium Face or Removing the Walkways and adding another tier of seats (Row AA?) Which could add another 250-300 Seats.