Sounds great to me. Depending on how much you pay your intern it might make more sense to grab an off the shelf solution. Remarkbox is only $48.
I'm just a fan of building my own stuff and having full control. Something like Disqus is out of the question for instance but I like the flow with Remarkbox.
How much control do I have though? Can I easily switch the sorting so newest remarks come first? Can I change the text on all the butttons/links? Can I replace "collapse" with an icon and move it to the left under the avatar? I don't even have to pose the question if I build it.