It seems there are many choices for police vehicles for GTA IV now. But I cannot find a NYPD style 2007 Nissan Altima. If any body could find and rip a model to GTA format for someone to make into a police vehicle, that would be awesome! :D 

Stop with these "challenges", they are just requests so post them in the Request Thread.

Find an unlocked Altima and any modeler could make that car in a half hour

Find an unlocked Altima and any modeler could make that car in a half hour

Yeah, even me and I haven't even been modelling that long :P. But are there any unlocked Altimas out there? I think his "challenge" is asking you to make an entire model from scratch. Oh well, whatever. I'll try and find unlocked Altimas and try and make this car.

You could convert one from SA. Harper has a tutorial for it.

You could convert one from SA. Harper has a tutorial for it.

Yeah, I found one from SA. I'll get on it! 

Yeah, even me and I haven't even been modelling that long :P. But are there any unlocked Altimas out there? I think his "challenge" is asking you to make an entire model from scratch. Oh well, whatever. I'll try and find unlocked Altimas and try and make this car.

Yea, due to there being like zero equipment and that simple lightbar it can be done fast and easily. No one is going to make a Ultima from scratch for a "challenge" lol. You might already find an unlocked one for GTA IV by just looking through the files on other modding sites. I've found cars that are unlocked already that have been released so if you find a Ultima for IV, download it and try and import it. It'll be a lot faster than converting one if you find one unlocked.