How do I install and BOOT Windows 7 on External Hard Drive?

Please please please help! I've been browsing the net for 2 days straight and can't find a decent answer.
I've partitioned my external hard drive (Western Digital Passport) using Disk Utility.
I have 4 paritions in total; 2 intended for Mac and 2 intended for Windows.
I used a GUID partition table for all 4 as displayed on the below picture.
Although I should note that when my external hard disk is booted in Windows it says that it uses Master Boot Record, please see picture 2 below.
I formatted the Mac Partitions to Mac OS Extended (Journaled) and the Windows Partitions to ExFat.
The Macs work beautifully; having successfully installed and booted Snow Leopard on them, and then backed up my 2 internal Mac Drives to them.
However, the Windows ones are a complete nightmare and I have no idea how to installl Windows 7 and then use them from there.
Can anyone offer a solution? I've heard so many conflicting ideas about this that it's made me dizzy just reading it all.
Thanks!

Yeah, I use Windows on bootcamp for both my Imac and my Macbook Pro.
In fact, seeing as my Mac partition on my external hard drive was successful i.e. I installed and can boot from them any time I like, couldn't I just use the external hard drive's partitions' bootcamp assistant and install/boot windows on there?

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