They do look pretty cool, but since you're going that far to making the boxes I thought you might be interested in this. The Cover Project has a thread where they're making pseudo-reproduction NES boxes. The results I've seen so far are awesome, and while they take a bit of work, the indication I've gotten is that once you're on a roll and have a method they're pretty quick to assemble.
Here's a link:
http://www.thecoverproject.net/forum...p?topic=4926.0
PS-Another option is printing out their existing covers and putting them in universal game cases, I normally do that with my SNES/Genesis games.