Sonic 2 Chemical Plant GBC loop

Hello, this thing is 8 years in the making, from the first concept in studio to this picture. The goal was to capture the level curves, but not necessarily be 100% accurate. Think of it as a 2.5D reimagining of the 1992 game. I actually have a much, much larger GBC loop (see last picture), complete with dual pipes and a working loop-de-loop (with vertical launch), but the return path is not yet fully connected, and I will never build the entire background for this. I've included a few WIP...