If anyone is interested, I downloaded a 2K roster with the rookies in it, and spent a couple hours trying to correctly place all the players who have moved thus far. I think I've got mostly everybody in the right place as of right now, and will keep updating it as free agency takes its course.
Obviously there are still a lot of guys in the free agent pool, so not all teams will be totally playable...but the Cavs are fucking awesome to play with. Dellavedova and Kadji are also available in the free agent pool if you want to get really crazy with them.
My GT is bHEINS33, so you can just use that to search for the roster file.
Also, just realized I forgot to change Bennett and Felix's numbers, so they may be wrong. I'll fix them for the next version.