I think it's silly to worry about Nintendo's IP's in regards to sharing our NES collections and "man-caves". It wouldn't have much to do with NESmakers, as it's our game collections and all that. Not like we are sharing roms or promoting fan made games that use others IP's. That'd be a different thing entirely.
I do agree that we would have to make it specifically NES related, like you said or it'd be off topic but I feel it'd be a nice way to bring the community together some. I mean we could always just start a thread in the Gaming section I suppose, probably would be easier.