Install Bootcamp on an External Drive?

Found this guide and figured the MBA would be the perfect application, has anyone tried it?
http://guides.macrumors.com/Boot_Camp_Windows_XP_On_External_Drive

If it doesn't work, then I may just install a 5GB BC install and put all my applications on an external drive.

 

One problem I just realized right off the bat is that with only one USB port and the USB Superdrive requirement to install bootcamp, will require a USB hub, assuming the USB Superdrive will work connected to a hub. I'm sure it'd at least need to be powered.

 

I'm going to try it, but I'm trying something else first.

I have Bootcamp running on my MBP and I'd love to just transfer it over to an external drive. So I'm going to try that first. I started to dd the partition from my MBP internal drive to my USB external at lunch. I'll report back on how it turns out.

I also read somewhere that others were manually creating 60MB boot partitions on the internal drive and then putting the system drive on the external disc. This might be a good compromise to removing the internal drive in the MBA.

 

I can clone the parition, but I don't know how to configure the partition table to make it bootable.

Also, at this point I don't want to spend $100 on messing with boot camp, so I converted my old bootcamp partition to parallels with Transporter and copied that to an external drive.

 

Duh!
I completly forgot that any USB CD Rom will work and I have an old one that came with my Sharp UM32W. I just tried it and it boots fine.

 

Hmm, cloned from what? Another bootcamp disk?
The problem is the partition table. Will the MBA boot a regular MBR or does it have to be GPT formated like other Intel Mac discs?

 

As a test I removed the drive from my MBP and installed it into a USB external enclosure. I then plugged it into my MBA and held the option key while I booted. The option to boot the OS X partition on the USB drive was available, but not the option to boot the bootcamp partition.