I prefer keeping the entire install in a single partition. That way I only need to backup and restore a single partition. I don't spend much time troubleshooting. If the OS is haywire, I simply revert back to an image that isn't. It takes less than 20 minutes, and I know the OS will function exactly the way it did when the image was created.
The guide you linked to is overly complicated.
Start with only the disk you want to install Windows to, connected to the computer.
Start the W7 install, and after 20 - 30 seconds stop the install and boot to a Live CD with a partition tool installed- like Hiren's Boot CD, or PartedMagic.
You will see that Windows created (at least) 2 partitions. Delete all but the first, and then extend that partition to include the entire disk. This method will ensure that the Windows partition is properly aligned. Using another tool to create the partition will likely result in a misaligned partition. If only the end of the partition is moved, and never the beginning, alignment will be maintained.
Now boot back to the Windows install DVD, select Custom Install, go to the disk selection dialog, and install W7 to the partition you have already prepared.
Wen the install is complete, boot to the Live CD again, and shrink the OS partition to the size you want it to be. But don't create new partitions with the CD, as they likely won't be aligned. Instead, boot back to Windows, go to disk management, and partition the remaining disk space how you like.
It's that simple.