So, I managed to copy my home directory off onto a portable drive overnight.
I managed to copy the website information and associated folderol.
I seem to be able to boot the machine with two of the six drives by telling it to ignore the home directory volume set.
I intend to go out and get a new drive to migrate the old boot drive data to and slowly migrate the home directory information from the portable drive to the live drive as needed.
I intend to set up at least two portable drives as backup devices.
I do not seem to have lost any files. Woo!