Weld the plants & suns to the diff casing. Dont weld in the centre cos if you bust anything you wont be able to take the diff apart
You can weld it in situ if you want but be sure to give it a huge clean after cos splatter from the welder could get on the CWP & damage em the second the drive the car.
Last one I did was in situ & has lasted so far

(bout 6 months now)
Will try find more piccy's
jb