I GREATLY appreciate that you took the time to make sure you could do challenge c without just reversing the waveform!
It makes the song as a whole feel more natural and less like it was done to check an arbitrary box.
I think the percussion was expertly chosen since it sounds so natural despite the strange caveat of the palindrome challenge.
I knew from the start I wasn't going to attempt challenge C but if I did I hope I would be smart enough to do it as well as you did!