Why do you worry about an upgrade script? Just upgrade it yourself manually - I mean are you up for the challenge or not? Posting this question seems to contradict your claim of being up to the challenge. Basicly once it goes gold, just replace beta files with the new files and update the database ...
The thing is, if you don't want to spend 5 minutes figuring it out youself, why should these people spend 5 minutes responding to you, like they have done 900 times before?