This is a fantastic idea. Honestly, I had never thought about it until now. Are you going to make other backwards games, like ruby/sapphire or gold/silver?
Although the mapping is mediocre at best, I think you get your point across very well as to what each area is and how it was supposed to be changed, and that's really all that matters in a hack. Nice graphics and touches are just buffs.
Although I won't be playing this hack (too much crap on my hands at the moment) I'll be lurking the forums as usual paying attention. Good luck, Godspeed.