ISD has a pretty friendly mobile site, I'm sure you've seen it. NDNation is still very much a "I'm viewing a non-mobile site on a phone" experience. I fat-finger things (like ignore-poster) all the time, the post reply tree is difficult to navigate, etc.
Just throwing this out there, I'm a software developer who would love to give a go at something like this. I have no app development experience, but it'd be a fun side project that I'd do for free, of course. I'm including my email if you have any interest.