Wow! What a cool concept. Great idea for a thread!
Also, I wanted to mention how amazing it is to hear the same song mixed by different people. If this doesn't show what happens beyond the musicians; I don't know what does. Same song; different sounds.
I do have a question that I hope doesn't disrupt the spirit of the thread. For me, a good portion of mixing comes comes down to arrangement/song structure. Is that out of bounds to change? Keeping the same stems; just changing the arrangement of them. Of course, it does sound as though people are ok with drums being changed.
I'm not saying I want to; but sort of considered it. Again, I get the thread is about mixing; and if this would ruin that in ANY way; it's a no go by me...and I'm fine with that.

Billy; great job on offering up your song to have some fun with. I'm loving what I'm hearing and you started it. Too cool in my book! We could really use more of this kind of thing, in my opinion.