There's also a Tifa battle model floating around here: 1_Tifa_Battle.zip
Her lower legs are attached backward and need rotating. I describe how to do this in my tutorial- Bootleg Edit for the FFVII Remix 2.5.1.
Also, the arms and feet detach during some battle animations.
This model needs a lot of help.
Aeris has replacement field and battle models: FF7 HQ Aerith mod.rar
IMHO the face doesn't look like Aeris.
Also, the texture is so HQ that it appears grainy.
Otherwise, this is very well done work.
Both models are excellent attempts, but need further refinement.