My advice:
install GAG
Install Operating Systems in any desired order
Install FreeBSD, leave the MBR untouched
Install Fedora, install GRUB into Fedoras /
Install CentOS, install GRUB into CentOSes /
Tell GAG which partition is which as necessary.
Sharing files will best be done via ext2 or ext3 for the partiton, yes you can share the / as long as config files don't cause problems with any system specifics (e.g. running KDE/Gnome on all three).
FreeBSD mounts ext3 as ext2 which means without journaling.
I would suggest partitioning as some thing like:
primary partition 1 -> some OS
primary partition 2 -> some OS
primary partition 3 -> some OS
extended partition ->
-> logical drive -> linux swap
-> logical drive -> /home for all systems
-> logical drive -> general purpose storage/recovery formated FAT32 (if there is disk space enough)
depending on what you need and want
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