I imported the sprites into Paint.net, made the basic layout, then went pixel by pixel to make sure it fit the collision, as this is a reskin of another stage.
This is a 1-for-1 reskin of PM’s Green Hill Zone. Includes 3 versions that alter the background / foreground sprites, with no other changes. Has 4 groovy tunes, UI, and is pixel perfect accurate to the stage.
Update: Brought the background closer. I tested the stage in 4:3, and turns out in 16:9 it cuts out :S I also changed the platform sprite for the Serious Business version to be less distracting.