exactly, too all of the above.
I have called mine "project neocron for hl2" because that way it doens't look like i'm trying to create a new game. Because It is KK's game, I have already said it's a fan project which was inspired by the main game.
I once asked (about 1.5 years ago) if they would be willing to sell the rights to the game, and for how much. at the time I was told no, and after working out some costs, it would be impractical to run on my budget of.. well, not alot.