SD, I am very impressed to hear someone actually recreate such a diamond, intricate track and beautifully orchestrated too and not pick a more simple track/loop that the original artist produced.
The intro builds very smoothly into the mainline almost sounding like a totally new track. The choir was a nice idea but when executed with everything else playing along side it, it simply gets pushed back, way back into background noise with no great significance or justice to the track. I would have only implemented it during more quiet parts like the bridge or intro and outro.
The meter is quite interesting as you have picked very key points to speed it up and slow it down signifying the more energetic parts and the more emotionally impacting parts with the harmony.
Your notes are spot on to the original, and the middle electric guitar sounding synth melody was a very nice changed addition to this already gorgeous tune. Very nice flow to the end of the track. The dubstep basslines sound very updated and add a little hip flavor to the track, however it also equally detracts from the track by breaking up the tempo and aural resonance of beauty that this track builds up almost muting it too much that it becomes distracting than adding new flavor.
The ending is absolutely gorgeous! The piano choice is definitely the best thing you've appended to this tune.
Overall, outstanding job, SD! 4.5/5