Auto to Manual O/D Gearbox Conversion

It looks like days of the auto box in the 2000 are numbered, as I've just managed to source a manual overdrive gearbox. I've had problems with the auto box getting stuck in 2nd gear when cold (yes there's plenty of oil in the box), and it's slowly getting worse. I have enjoyed the auto, but my preference is manual/overdrive. Just need to sort out all the other bits required for the conversion...