Using Nintendo’s branding in the box seems ill-advised. That’s giving Nintendo more fodder for the eventual lawsuit.
Lawsuit to what? Their CAD files, the build instructions? The board shipped with the Nintendo Wii?
Using a brand name like this just makes things easier when Nintendo attorneys barely have to roll out of bed when sending a cease and desist order.
Just call it Kawaii and stay slightly under the radar. Sadly, Nintendo will probably come for you anyways.