Well, mind you, all this stuff for ff7 has been a long time coming. Its only been in the last... 6 months that people have really cracked ff7s data files and such to make these things, when people have been working behind the scenes on unlocking the formats for years.
ff8 would require starting fresh, and, there seems to be some exaustion in the community (qhimm, halkun, and saint have bene kinda quiet lately). If you want, check out the TECH RELATED forum and do a search for ff8 and see what kind of progress people have made.