Ok, I've ripped tiles I need for this project from SML rom using Tile Layer Pro (great program for rom hackers) and then masked them (as I'm using pixel-perfect collision, I need mask for each sprite so it won't collide where it shouldn't and collide where it should).

I've also started to code chunk rendering stuff and I'm dying to try it out, but I can't as it is not finished yet. Will be able to post some preliminary screenshots then.