I thought about implementing something similar (I read through the reverse engineering docs).
All of the information was done through clean room reverse engineering (the reason it took so long for something like this is that Nintendo used a very wonky wireless protocol). As such, I don't see what they could sue for, as that is entirely legal (at least in the US).
Well clean-room reverse engineering doesn't protect you from patent infringement - only for copyright related issues. I don't think that's a real concern for your project though, as patents only last for 20 years, so most if not all patents related to the WaveBird should have expired already.
All of the information was done through clean room reverse engineering (the reason it took so long for something like this is that Nintendo used a very wonky wireless protocol). As such, I don't see what they could sue for, as that is entirely legal (at least in the US).