AD-OD Intergration Questions!!

Hi guys, First of all thanks so much for the help so far & the great AD-OD Intergration 2.1 White paper, I do have a few questions tho: 1) Is it possible to use PHD when in an OD-AD environment? (If so how? I can log in as a manged user but the users home doesn't seem to sync @ login & logout!) 2) If using PHD with 100 users, with their PHD being on a SAN is it ok to have just two X-Serves? (One Master & One Replica). 3) When copying the home folder via terminal & the changing the ownership via chown how can you do this with a user that is only in OD thru an AD group? 4) Is have a username with a fullstop in the middle going to cause me lots of issues? (i.e. john.smith) Thanks in advance!!