First off what is wrong with your tranny? Whay are you rebuilding it?
If you are trying to make it stronger for turbo, what you are doing is a waste of time. Just get a 00-02 P11 tranny for turbo
Look at it like this.
$300 to pull your tranny out and put it back in.
$900 is left over.
You can buy a B14 tranny that is good for $400
So install and B14 tranny $700