So you still run into the problem with disk space. You'd be able to re-use a lot of stuff, but to get the SA feel from a IV generation GTA, you are going to need to at very least double the disk space requirement. So you are looking at a 30GB game. This really isn't a big problem for PS3. It has a lot of HDD space and support for 50GB disks. This isn't too big of a problem for PC either. Of course, a 30GB install from 3 DVDs is not going to be much fun, but c'est la vie. The biggest thorn here is 360, which supports only 9GB and doesn't even come with HDD on all models. You can't do anything significantly bigger than Liberty City on 360. Yeah, you can spread it out, put some fields, mountains, and forests between cities, but the combined urban area could not be increased much. That's just the fact of life.