Mewtwo2000 has done that already though.@Tybis You make stages, right? Is it possible for you to make a 64 version of Battlefield (where you fight the fighting polygon team) and final destination (where you beat up master hand)?
And would it possible for all 64 style stages to return? I'd LOVE if they were all super accurate (Yoshi's with the clouds and Kongo with the barrel, though leave Peach's castle with ledges on the bottom level please...), but even just having them all I think would be awesome, since I liked all those stages (whenever I play my computer emulator, I often hit random and play where-ever). I would appreciate keeping the current Mario Bros. level as well (if that was meant to count as the modified 64 stage).
As for accurate YI and CJ I'd think that is a rel thing. It's highly unlikely as rels haven't been looked in to much until recent.