Yeah, I think I might be nuts too. That's a bit ambitious for a late night hobby.
Still, I've conscripted the help of a kind soul who wants TMX maps in SpriteKit as well as having been given source access to the developing kobold2d. I might even use that source as a cheat sheet if I get really stuck. =) But for the most part, this is a learning experience. I've been able to make a TMX generator, so why not a TMX map viewer?
Well, so far so good. Mostly.
Also of note, an awesome game developer, Noel Berry, that I follow on twitter posted some thoughts of his about procedural generation in his current project. It's worth a read, and it has source!