Well done! This mod of your seems to be going great!
I did notice a few graphical errors and 'random deaths', but there was really something in this mod! The amount of detail you put in was awesome, and the ring and box placements were good too.
The levels you've made have a MASSIVE replayability rate, I must have played each level at least 5 - 8 times before quitting.
I also experienced the lag in stage 1, but it was still a cool level to play!
I too, haven't played sonic 360 but i'm guessing it looks just as good as what you have made!
Congrats on this great mod, and I hope you do well with the rest of it!