This hack looks good! I like most of the screenshots, and I like how you're going for a SMB1 style, but there are a few things that bother me:
-You used SMB1 pipes as well as SMW pipes... it's not a big issue, but it's inconsistent.
-That overworld could use a lot of improvement. Make something other than flat land (add some hills, some curves, and some decorations)!
-The MARIO in the status bar is messed up. While I don't find this to be much of an issue, others do. D:
-In some of the underground screenshots, one of the background tiles doesn't align with the rest of them and has different colors; change it a bit so that it aligns with the other tiles.
Aside from that, this hack looks nice, and I think that it will turn out well.
Your layout has been removed.