Hi David,
By the way, as an aside, rather than using multiboot, have you considered
using a virtual machine environment?
Specifically, either Oracle VirtualBox, which is Open Source Software under the
terms of the GNU General Public License (GPL) version 2, or
the commercial VMware Workstation.
See
https://www.virtualbox.org/
See
http://www.vmware.com/au/products/workstation
If you do go that path, suggest you make the host machine (the one that
runs natively on the hardware and is running the virtual machine server),
a 64-bit distribution. That way, if you have more than 4GB of RAM,
you can exploit it over multiple virtual machines.