I'm not sure if this is possible but...
If it were possible..
Could someone modify the ff8 engine and change... just about everything? (music, models, text, maps, etc)...
If it could be done... It would be alot easier to remake ff7 on the ff8 engine (I think it is the same engine, but ff8 looks alot better [optimized version of the engine?])... The battle models for ff7 could be re-animated for world mode in ff8.. and if the maps were to be changed, well, I'd start playing ff7 again...
The reason I don't play it now : I get to the end of disc 1 and get sick of it, I honestly like ff8 a bit more than 7... I'm not asking to be flamed about it though. I have a right to my opinion as you have a right to yours.