Hmmm I think you can recreate the map structure ( with some trickys,but i think that there its posible),the backgrounds labels are the only 1 problem.
I dont know so much about the walkmesh edit(im learning with the errors xD) but for now i see 1 limitation,i cant made that the map camera zoom in or zoom out the background image,only the walkmesh....but if you modify 1 map of ff7 with similar background resolution and similar background zoom as ff8, it could be very close as the original ,thats the way how i made the first 2 maps for now.
To explain this technical things in english its difficult to me ,sorry o_O