Disk utility to make bootable Vista on external hard drive

Hi All,
I've browsed a bit in search of an answer to this question but I've not gotten anything definitive yet. I hope you can help...
My goal is to do turn a disk image (iso) into a bootable Vista install, on an external hard drive. I have successfully done this on the EHD using this process:
http://iuseapple.com/blog/apple-how-to/advanced-os-x/2007/10/29/how-to-install-l eopard-from-external-firewire-hard-drive/
My reasoning was that a similar process would work for Vista, but I'm hitting a wall. Some ideas of what may be the problem:
The Vista partition on my EHD is 2.5 gigs, which is just a hair larger than my iso of Vista. Should I make the partition more generous?
The partition is formatted in FAT32. I have had issues with this before, when trying to put over 2GB (or was it 4GB?) onto a FAT32 disk at once. I learned how to split dmgs/isos into pieces and move them over like that. Could that be the issue? If so, is it possible to accomplish my goal with a multi-part image?
I don't know that much about Vista. Will it just not tolerate a boot from an EHD?
The progress I've made so far is limited--I keep hitting a wall in Disk Utility. As in the Leopard approach, I attempt to Restore the image (Vista.iso) to the target drive (Win Vista). The computer thinks about it and then gives me a 254 error and a message along the lines of "could not validate source."
Any help would be appreciated. (Including a definitive "this won't work.")
Thanks in advance,
edge65

Windows will neither install on nor boot from external drives.

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