What's the state of the project?
Very early in development, but the developer is now busy doing a lego island decompilation soo.
So it's MattKC. I've seen a few of his videos and he seems to know what he's doing so I'll definitely be following this.
Damn... what a bummer.
Since its open source couldn't you just mod the original soundtrack in yourself?
I don't get what you mean with "mod the original soundtrack"?
The source code for a decompilation of a game can only be available legally because someone who isn't the original dev created the decomp and decided to share it publicly. All assets in the game were still created by the original developers, and can't be freely shared. This means the open source decompilation will need a way to load assets from the original game to remain legal to redistribute. This includes things like textures, 3d models, and music.
Chances are, once this project is completed, you'll need an original copy of the game to play, and it'll use the cars, maps, and music from the original game.
I'd have my doubts the decomp itself wouldn't be subject to copyright - suspect you'd need to reimplement something compatible. Would love to hear an expert opinion, I'd be tempted to try and tackle something myself (albeit nothing nearly on this scale)