I have seen some posting where people say the 1356 and 205 have some clearance issues, so you have to put a little more room in between them. Other than that the 1356 shaft is hollow to a point for lubrication. The 1356 shaft has to be a little longer so you do not cut the new splines into the hollow portion (making it weaker). All of this is from the interweb.
I think the stub shaft is the hard thing to do here, I just can't figure out why more people don't send it off to Moser and be done with it.