You've downloaded full games?? I would never do that with my small 8gb of space. I would have gotten the 32gb Wii U, but I'm probably going to sell my Wii U at the end of the year for a Japanese region Wii U. Yeah, a hard drive would be a good investment. Make sure you find a good stable one because I've heard of the data becoming corrupt randomly when used with Wii U.
Why???? :O
Your towns good as it is. I don't see why you would need a different layout.