The iPod 5/5.5G is the iPod Video, you'll find it in our manuals as such.
Incidentally, did you get scammed(*) into paying stupid amounts of money for the "Hi-Fi" "audiophile" conversion? I ask this because you mention the Wolfson DAC specifically as though it is something every other iPod Video in the world doesn't have.
It's pure snake oil, but, live and learn I guess...something something, hindsight.
(*)Edit: May I ask how much you spent on this? I ask because I've seen some truly ridiculous prices for this type of setup and you could've stuck this together yourself for under $200 USD, including the purchase price of the iPod itself.
Edit 2: I realize this comment didn't end up being particularly productive, and I have a feeling that if you read this you'll probably be rather annoyed, either at yourself, charlatan resellers, or both but hopefully this comment goes some ways towards making sure others in the community dont imbibe the same snake oil in the future.
If you do feel scammed or hard done by I'm genuinely sorry for bringing it to your attention.
[Saint]