If a reboot occurs (power goes out, whatever) you won't loose whatever is on /home, if it's on permanent storage. You just need to specify its location again, the same as when you did the first time. The setup script will wait for you to do so. For this reason, I don't see any need to make a remaster that mounts a specific device. If you want to do so, search the make_pelican script for
mount /dev/\$HOMELOCATION /home
and replace $HOMELOCATION with the device name you want to use. That should do it. You might also want to comment out the dialog that asks you to input the home location device.