Might be the best incorporation of Koopa the Quick (as I will now name him) I've seen yet! He's running right along the back stage area

(The koopa is the one that rides the train in Western Land. I was able to delete the train model since it was easy to find, but the koopa is more generic and probably used elsewhere, and I don't know where the model is. Could also try to find his coordinates and move him offscreen I suppose.)
But on a more serious note, I like the idea. I hope that the image isn't too steep, since it appears initially right now to be steeper than the original boards.