No, nobody did yet, you're the only programmer who cares about this game so far.
The cars' geometry is stored as GEO files inside VIV archives (there are tools that can edit VIV files, so don't bother decrypting them and get VIVEditor, it works perfectly fine with PSX VIVs as well). There are 3 VIVs for each playable car: one is for car select menu (high LOD only), one is for single player mode/player's car (high LOD only), one is for 2 players mode (low LOD only).