IT'S ALIVE!
It took seven years and it's still not done yet, but I finally got this pack to a close enough completion state where I'm ready to re-release it to the world. My bare minimum criteria was all the blocks and items being finished and as much extra functionality added as I could, so you have a good reason to download it even if you don't care about Mega Man at all.
At this point I just don't enjoy Minecraft as much without my own resource pack adding a lot of life and color to it, so I practically needed to finish it again.