Congratulations. I do hope that the damage from the PRAM battery can be repaired.
Be warned, however, about the power supply. These things are on their last legs. They are loud too. @BadGoldEagle has a great thread on rebuilding the PSU from the Q950.
I think you are lucky that the battery exploded in a board that is vertical so the acid just slides down and doesn't pool. RAM sockets and RAM are easier to replace then finding broken traces in a multi layer board.