Decomp: https://github.com/Rubberduckycooly/Sonic-CD-11-Decompilation
Mods used:
Sonic CD Separated Past Themes - SoN1c2001, US Past Themes by KingMeteorStudios
Higher Quality JP/US Music Mod - Darkskull Dawn Zenith
Restart Special Stages/Time Attack - MegAmi
1996 PC Title Screen - RetroForever
Finding the Transporters and Projectors in Quartz Quadrant is very easy, though here, the Projector is at the very beginning of the level, so you'll need to backtrack a fair bit.
Time traveling is actually a tiny bit harder in the 2011 version. For whatever reason, you need to stay at a high speed for a bit longer. This usually isn't that noticeable, but there's a few spots throughout the game that no longer work as good time travel spots.
At this time, SuperFreaksDev has 531 views for Sonic CD spread across 43 videos. The game makes up 1 hour of published video on his channel, roughly 2.40% of Sonic CD content that SuperFreaksDev has uploaded to YouTube.