i woudn't call it a reverse mod, it's really just a clone. think about all the mario/pac-man/tetris/etc games that use the original sprites and music in there clones, isn't that the same thing?
edit: also,. I don't own the original game, and 4GB is wayy too much to dl on my bandwidth cap so i can't comment on your work. but it sounds like a great effort, and it seems like your doing your best to avoid distributing copyrighted work, so good job.